title: Remove Ecto from existing Phoenix project
body: <p>I have an existing project built with default settings. Now I see that I dont really need Ecto for anything. I just want to remove all DB related events from the code. </p>
  
  <p>Can someone guide me through the process ? </p>
  
  <p>I have removed all mention of Ecto from mix.exs but I guess thats not enough</p>
  
  <p>Update: </p>
  
  <p>I found ecto mentioned in lib/api_test/repo.ex file. If I remove the line it gives the following error </p>
  
  <pre><code>=INFO REPORT==== 21-Jul-2016::12:43:30 ===
      application: logger
      exited: stopped
      type: temporary
  ** (Mix) Could not start application api_test: ApiTest.start(:normal, []) returned an error: shutdown: failed to start child: ApiTest.Repo
      ** (EXIT) an exception was raised:
          ** (UndefinedFunctionError) function ApiTest.Repo.start_link/0 is undefined or private
              (api_loc) ApiTest.Repo.start_link()
              (stdlib) supervisor.erl:365: :supervisor.do_start_child/2
              (stdlib) supervisor.erl:348: :supervisor.start_children/3
              (stdlib) supervisor.erl:314: :supervisor.init_children/2
              (stdlib) gen_server.erl:328: :gen_server.init_it/6
              (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
  </code></pre>