remove .coffee extension on compiled version of CoffeeScript files

When compiled, CoffeeScript files had names like "my_lib.coffee.js". This
broke compatibility with RequireJS.  Changing the naming convention to use
only the .js extension allows files to be used as RequireJS modules.

README.md

@@ -1,4 +1,4 @@
-_This project is dead. You should use [Karma](http://karma-runner.github.io/) instead. I do._
+_I am looking for a new maintainer for this project. Please contact me via GitHub if you're interested._
 
 # Jasmine Headless WebKit runner
 

lib/jasmine/headless/coffee_script_cache.rb

@@ -14,6 +14,11 @@ module Jasmine
       def action
         CoffeeScript.compile(File.read(file))
       end
+
+      def relative_cache_file
+        super.gsub(/.coffee$/, '')
+      end
+
     end
   end
 end