Remove old style package support

All packages have been migrated to the new style.

src/app/package.coffee

@@ -1,5 +1,4 @@
 fs = require 'fs'
-_ = require 'underscore'
 
 module.exports =
 class Package
@@ -7,25 +6,13 @@ class Package
     TextMatePackage = require 'text-mate-package'
     AtomPackage = require 'atom-package'
 
-    oldStylePackage = _.find fs.list(path), (filePath) =>
-      /index\.coffee$/.test filePath
-
     if TextMatePackage.testName(path)
       new TextMatePackage(path)
     else
-      if not oldStylePackage
-        new AtomPackage(path)
-      else
-        try
-          PackageClass = require path
-          new PackageClass(path) if typeof PackageClass is 'function'
-        catch e
-          console.warn "Failed to load package at '#{path}'", e.stack
+      new AtomPackage(path)
 
   name: null
   path: null
 
   constructor: (@path) ->
     @name = fs.base(@path)
-
-  activate: (rootView) ->