Various post-repo-split cleanup (#6910)

no issue

- remove bower from dependencies, greenkeeper ignores & .editorconfig
- remove old custom jscs rule for ember

.editorconfig

@@ -13,7 +13,7 @@ trim_trailing_whitespace = true
 [*.hbs]
 insert_final_newline = false
 
-[{package,bower}.json]
+[{package}.json]
 indent_size = 2
 
 [*.md]

.jscsrc

@@ -1,5 +1,4 @@
 {
-    "additionalRules": [ "core/test/utils/jscs-rules/*.js" ],
     "requireCurlyBraces": [
         "if",
         "else",

core/test/utils/jscs-rules/disallow-object-controller.js

@@ -1,32 +0,0 @@
-var assert = require('assert');
-
-module.exports = function () {};
-
-module.exports.prototype = {
-    configure: function (disallowObjectController) {
-        assert(
-            typeof disallowObjectController === 'boolean',
-            'disallowObjectController option requires boolean value'
-        );
-        assert(
-            disallowObjectController === true,
-            'disallowObjectController option requires true value or should be removed'
-        );
-    },
-
-    getOptionName: function () {
-        return 'disallowObjectController';
-    },
-
-    check: function (file, errors) {
-        var lines = file.getLines();
-
-        lines.forEach(function (line, index) {
-            var location = line.indexOf('ObjectController.extend');
-
-            if (location !== -1) {
-                errors.add('Ember.ObjectController is deprecated, please use Ember.Controller and access model properties directly.', index + 1, location + 1);
-            }
-        });
-    }
-};

package.json

@@ -76,7 +76,6 @@
     "pg": "4.1.1"
   },
   "devDependencies": {
-    "bower": "1.4.1",
     "csscomb": "3.1.8",
     "grunt": "1.0.1",
     "grunt-bg-shell": "2.3.3",
@@ -109,7 +108,6 @@
   },
   "greenkeeper": {
     "ignore": [
-      "bower",
       "glob",
       "mysql",
       "nodemailer",