title: mix phx.gen.html generator immediately causes compile errors?
body: <p>I'm making a new Phoenix app for the first time in about a year, and trying to get a handle on everything that's changed with regards to context etc.</p>
  
  <p>My first order of business is creating a database table where I can track email signups, so I put this command in:</p>
  
  <p><code>mix phx.gen.html Signups Email emails email:string name:string data:text</code></p>
  
  <p>And then I put the new routes in my router.ex. But even before I can migrate, I get an error:</p>
  
  <pre><code>== Compilation error in file lib/appname/views/email_view.ex ==
  ** (CompileError) lib/appname/views/email_view.ex:2: module AppnameWeb is not loaded and could not be found
      (elixir) expanding macro: Kernel.use/2
      lib/appname/views/email_view.ex:2: AppnameWeb.EmailView (module)
      (elixir) lib/kernel/parallel_compiler.ex:121: anonymous fn/4 in Kernel.ParallelCompiler.spawn_compilers/1
  </code></pre>
  
  <p>I have <code>Appname.Web</code> other places in my app, but the generator created a new module called AppnameWeb that doesn't seem to be loaded anywhere?</p>
  
  <p>If I do a find and replace in my project to Appname.Web to AppnameWeb, it lets me migrate but still fails to load the new emails index page.</p>
  
  <pre><code>Request: GET /emails
  ** (exit) an exception was raised:
      ** (UndefinedFunctionError) function Appname.EmailController.init/1 is undefined (module Appname.EmailController is not available)
          Appname.EmailController.init(:index)
          (appname) web/router.ex:1: anonymous fn/1 in Appname.Router.__match_route__/4
          (phoenix) lib/phoenix/router.ex:278: Phoenix.Router.__call__/1
          (appname) lib/appname/endpoint.ex:1: Appname.Endpoint.plug_builder_call/2
          (appname) lib/plug/debugger.ex:99: Appname.Endpoint."call (overridable 3)"/2
          (appname) lib/appname/endpoint.ex:1: Appname.Endpoint.call/2
          (plug) lib/plug/adapters/cowboy/handler.ex:15: Plug.Adapters.Cowboy.Handler.upgrade/4
          (cowboy) /Users/user/Dev/appname/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4
  </code></pre>
  
  <p>So am I supposed to have both Appname.Web and AppnameWeb? I'm not sure what's supposed to go where any more, and the fact that the generator generates broken code isn't helping...</p>