title: Pow not loading gem properly while rails s works
body: <p>I have an error when using pow, but it works perfectly with rails s. Here is the results of the same code on Heroku: <a href="http://www.contakapp.com" rel="nofollow noreferrer">www.contakapp.com</a> <img src="https://i.stack.imgur.com/t1DYy.png" alt="enter image description here"></p>
  
  <p>I believe the chunky_png-1.2.8 is from the foundation gem or some related issue. So I am also providing my whole gem file:</p>
  
  <pre><code>source 'https://rubygems.org'
  ruby '1.9.3'
  
  gem 'rails', '4.0.0'
  
  #views
  gem 'jquery-rails'            , '~&gt; 2.2.1'
  gem 'haml-rails'              , '~&gt; 0.4'
  
  #auth
  gem 'omniauth-facebook'       , '~&gt; 1.4.0'
  gem 'omniauth-linkedin'       , '~&gt; 0.1.0'
  
  #API
  gem 'twitter'                 , '~&gt; 4.8.1'
  gem 'rest-client'             , '~&gt; 1.6.7'
  
  
  # models
  gem 'pg'
  
  gem 'coffee-rails'
  gem 'uglifier'
  gem "font-awesome-rails"
  gem 'sass-rails'
  gem "compass-rails",    github: "milgner/compass-rails", ref: "1749c06f15dc4b058427e7969810457213647fb8"
  gem "zurb-foundation", "~&gt; 4.3.0"
  
  group :development, :test do
  
  end
  
  group :development do
  
  end
  
  group :production, :staging do
      gem 'rails_12factor'
  end
  </code></pre>
  
  <p>gemfile.lock</p>
  
  <pre><code>GIT
    remote: git://github.com/milgner/compass-rails.git
    revision: 1749c06f15dc4b058427e7969810457213647fb8
    ref: 1749c06f15dc4b058427e7969810457213647fb8
    specs:
      compass-rails (1.0.3)
        compass (&gt;= 0.12.2, &lt; 0.14)
  
  GEM
    remote: https://rubygems.org/
    specs:
      actionmailer (4.0.0)
        actionpack (= 4.0.0)
        mail (~&gt; 2.5.3)
      actionpack (4.0.0)
        activesupport (= 4.0.0)
        builder (~&gt; 3.1.0)
        erubis (~&gt; 2.7.0)
        rack (~&gt; 1.5.2)
        rack-test (~&gt; 0.6.2)
      activemodel (4.0.0)
        activesupport (= 4.0.0)
        builder (~&gt; 3.1.0)
      activerecord (4.0.0)
        activemodel (= 4.0.0)
        activerecord-deprecated_finders (~&gt; 1.0.2)
        activesupport (= 4.0.0)
        arel (~&gt; 4.0.0)
      activerecord-deprecated_finders (1.0.3)
      activesupport (4.0.0)
        i18n (~&gt; 0.6, &gt;= 0.6.4)
        minitest (~&gt; 4.2)
        multi_json (~&gt; 1.3)
        thread_safe (~&gt; 0.1)
        tzinfo (~&gt; 0.3.37)
      arel (4.0.0)
      atomic (1.1.10)
      bcrypt-ruby (3.0.1)
      builder (3.1.4)
      chunky_png (1.2.8)
      coffee-rails (4.0.0)
        coffee-script (&gt;= 2.2.0)
        railties (&gt;= 4.0.0.beta, &lt; 5.0)
      coffee-script (2.2.0)
        coffee-script-source
        execjs
      coffee-script-source (1.6.3)
      compass (0.12.2)
        chunky_png (~&gt; 1.2)
        fssm (&gt;= 0.2.7)
        sass (~&gt; 3.1)
      erubis (2.7.0)
      execjs (1.4.0)
        multi_json (~&gt; 1.0)
      faraday (0.8.7)
        multipart-post (~&gt; 1.1)
      font-awesome-rails (3.0.2.0)
        railties (&gt;= 3.1)
      fssm (0.2.10)
      haml (4.0.1)
        tilt
      haml-rails (0.4)
        actionpack (&gt;= 3.1, &lt; 4.1)
        activesupport (&gt;= 3.1, &lt; 4.1)
        haml (&gt;= 3.1, &lt; 4.1)
        railties (&gt;= 3.1, &lt; 4.1)
      hashie (1.2.0)
      hike (1.2.3)
      httpauth (0.2.0)
      i18n (0.6.4)
      jquery-rails (2.2.1)
        railties (&gt;= 3.0, &lt; 5.0)
        thor (&gt;= 0.14, &lt; 2.0)
      jwt (0.1.8)
        multi_json (&gt;= 1.5)
      mail (2.5.4)
        mime-types (~&gt; 1.16)
        treetop (~&gt; 1.4.8)
      mime-types (1.23)
      minitest (4.7.5)
      multi_json (1.7.7)
      multipart-post (1.2.0)
      oauth (0.4.7)
      oauth2 (0.8.1)
        faraday (~&gt; 0.8)
        httpauth (~&gt; 0.1)
        jwt (~&gt; 0.1.4)
        multi_json (~&gt; 1.0)
        rack (~&gt; 1.2)
      omniauth (1.1.3)
        hashie (~&gt; 1.2)
        rack
      omniauth-facebook (1.4.0)
        omniauth-oauth2 (~&gt; 1.0.2)
      omniauth-google (1.0.2)
        multi_json
        omniauth (~&gt; 1.0)
        omniauth-oauth
      omniauth-linkedin (0.1.0)
        omniauth-oauth (~&gt; 1.0)
      omniauth-oauth (1.0.1)
        oauth
        omniauth (~&gt; 1.0)
      omniauth-oauth2 (1.0.3)
        oauth2 (~&gt; 0.8.0)
        omniauth (~&gt; 1.0)
      omniauth-twitter (1.0.0)
        multi_json (~&gt; 1.3)
        omniauth-oauth (~&gt; 1.0)
      pg (0.15.1)
      polyglot (0.3.3)
      rack (1.5.2)
      rack-test (0.6.2)
        rack (&gt;= 1.0)
      rails (4.0.0)
        actionmailer (= 4.0.0)
        actionpack (= 4.0.0)
        activerecord (= 4.0.0)
        activesupport (= 4.0.0)
        bundler (&gt;= 1.3.0, &lt; 2.0)
        railties (= 4.0.0)
        sprockets-rails (~&gt; 2.0.0)
      rails_12factor (0.0.2)
        rails_serve_static_assets
        rails_stdout_logging
      rails_serve_static_assets (0.0.1)
      rails_stdout_logging (0.0.1)
      railties (4.0.0)
        actionpack (= 4.0.0)
        activesupport (= 4.0.0)
        rake (&gt;= 0.8.7)
        thor (&gt;= 0.18.1, &lt; 2.0)
      rake (10.1.0)
      rest-client (1.6.7)
        mime-types (&gt;= 1.16)
      sass (3.2.9)
      sass-rails (4.0.0)
        railties (&gt;= 4.0.0.beta, &lt; 5.0)
        sass (&gt;= 3.1.10)
        sprockets-rails (~&gt; 2.0.0)
      simple_oauth (0.2.0)
      sorcery (0.8.2)
        bcrypt-ruby (~&gt; 3.0.0)
        oauth (~&gt; 0.4.4)
        oauth2 (~&gt; 0.8.0)
      sprockets (2.10.0)
        hike (~&gt; 1.2)
        multi_json (~&gt; 1.0)
        rack (~&gt; 1.0)
        tilt (~&gt; 1.1, != 1.3.0)
      sprockets-rails (2.0.0)
        actionpack (&gt;= 3.0)
        activesupport (&gt;= 3.0)
        sprockets (~&gt; 2.8)
      thor (0.18.1)
      thread_safe (0.1.0)
        atomic
      tilt (1.4.1)
      treetop (1.4.14)
        polyglot
        polyglot (&gt;= 0.3.1)
      twitter (4.8.1)
        faraday (~&gt; 0.8, &lt; 0.10)
        multi_json (~&gt; 1.0)
        simple_oauth (~&gt; 0.2)
      tzinfo (0.3.37)
      uglifier (2.1.2)
        execjs (&gt;= 0.3.0)
        multi_json (~&gt; 1.0, &gt;= 1.0.2)
      zurb-foundation (4.3.0)
        sass (&gt;= 3.2.0)
  
  PLATFORMS
    ruby
  
  DEPENDENCIES
    coffee-rails
    compass-rails!
    font-awesome-rails
    haml-rails (~&gt; 0.4)
    jquery-rails (~&gt; 2.2.1)
    omniauth-facebook
    omniauth-google
    omniauth-linkedin
    omniauth-twitter
    pg
    rails (= 4.0.0)
    rails_12factor
    rest-client (~&gt; 1.6.7)
    sass-rails
    sorcery
    twitter (~&gt; 4.8.1)
    uglifier
    zurb-foundation (~&gt; 4.3.0)
  </code></pre>