build: Upgrade grunt-jscs and remove legacy jshint camelcase/nomen

Follows-up 4ec6b0cce.

grunt-jscs v0.7.0 upgraded node-jscs to v0.6.0 which introduced
the ability to disable rules via inline comments.

This means we can finally remove the deprecated jshint rules for
coding style rules and restrict jshint to code quality only.

Unsuppress the equivalent rules from jscs.

Change-Id: Idacf7e552d656ee139863d927e5bfc1f86af8283

.jscsrc

@@ -1,10 +1,8 @@
 {
 	"preset": "wikimedia",
 
-	"disallowDanglingUnderscores": null,
 	"disallowKeywordsOnNewLine": null,
 	"disallowQuotedKeysInObjects": null,
-	"requireCamelCaseOrUpperCaseIdentifiers": null,
 	"requireSpacesInsideArrayBrackets": null,
 	"validateIndentation": null
 }

.jshintrc

@@ -22,9 +22,5 @@
 		"mediaWiki": true,
 		"jQuery": false,
 		"QUnit": false
-	},
-
-	// Legacy (to be handled by jscs once supported)
-	"camelcase": true,
-	"nomen": true
+	}
 }

resources/src/mediawiki.legacy/ajax.js

@@ -5,7 +5,7 @@
  * http://www.modernmethod.com/sajax/
  */
 
-/*jshint camelcase:false */
+/*jscs:disable requireCamelCaseOrUpperCaseIdentifiers */
 /*global alert */
 ( function ( mw ) {
 

resources/src/mediawiki.special/mediawiki.special.upload.js

@@ -382,10 +382,11 @@
 				};
 				img.src = dataURL;
 			}, mw.config.get( 'wgFileCanRotate' ) ? function ( data ) {
-				/*jshint camelcase:false, nomen:false */
 				try {
 					meta = mw.libs.jpegmeta( data, file.fileName );
+					// jscs:disable requireCamelCaseOrUpperCaseIdentifiers, disallowDanglingUnderscores
 					meta._binary_data = null;
+					// jscs:enable
 				} catch ( e ) {
 					meta = null;
 				}

tests/frontend/package.json

@@ -9,7 +9,7 @@
     "grunt-contrib-jshint": "0.10.0",
     "grunt-contrib-watch": "0.6.1",
     "grunt-banana-checker": "0.2.0",
-    "grunt-jscs": "0.6.1",
+    "grunt-jscs": "0.8.1",
     "grunt-jsonlint": "1.0.4"
   }
 }