title: YAML Parsing Issue in Rails
body: <p>I have an issue on Elastic Beanstalk deployment which is:</p>
  
  <pre><code>YAML syntax error occurred while parsing /var/app/ondeck/config/database.yml. Please note that YAML must be consistently indented using spaces. Tabs are not allowed. Error: (&lt;unknown&gt;): found character that cannot start any token while scanning for the next token at line 2 column 1 /var/app/ondeck/config/environment.rb:5:in `&lt;top (required)&gt;' /opt/rubies/ruby-2.4.2/bin/bundle:23:in `load' /opt/rubies/ruby-2.4.2/bin/bundle:23:in `&lt;main&gt;'
  
  Caused by: Psych::SyntaxError: (&lt;unknown&gt;): found character that cannot start any token while scanning for the next token at line 2 column 1 /var/app/ondeck/config/environment.rb:5:in `&lt;top (required)&gt;' /opt/rubies/ruby-2.4.2/bin/bundle:23:in `load' /opt/rubies/ruby-2.4.2/bin/bundle:23:in `&lt;main&gt;' Tasks: TOP =&gt; environment (See full trace by running task with --trace).
  </code></pre>
  
  <p>As what I have read, this is because YAML forbids using tabs, instead it uses spaces. </p>
  
  <p>The problem is that I manually checked every YAML file for tabs, and never found one. I think I missed something <strong>so my question is</strong>: is there any script that can go through my entire source code replacing tabs with 2 spaces in every YAML file?</p>