Build: Update jscs and fix some code style issues

Disables the checks for casing and line length, since those need a lot
more effort to address. For variable naming the fix isn't obvious to me.
There's way too many lines over 100 chars.

.jscs.json

@@ -1,3 +0,0 @@
-{
-    "preset": "jquery"
-}

.jscsrc

@@ -0,0 +1,9 @@
+{
+	"preset": "jquery",
+
+	// disabled until `widget_slice` et al are addressed
+	"requireCamelCaseOrUpperCaseIdentifiers": null,
+
+	// Ref https://github.com/jquery/contribute.jquery.org/issues/80#issuecomment-45253460
+	"maximumLineLength": null
+}

build/tasks/testswarm.js

@@ -50,7 +50,7 @@ function submit( commit, runs, configFile, extra, done ) {
 	}
 
 	testswarm.createClient({
-		url: config.swarmUrl,
+		url: config.swarmUrl
 	})
 	.addReporter( testswarm.reporters.cli )
 	.auth({

package.json

@@ -73,7 +73,7 @@
 		"grunt-esformatter": "0.2.0",
 		"grunt-git-authors": "1.2.0",
 		"grunt-html": "1.0.0",
-		"grunt-jscs-checker": "0.3.1",
+		"grunt-jscs": "0.6.2",
 		"load-grunt-tasks": "0.3.0",
 		"rimraf": "2.1.4",
 		"testswarm": "1.1.0"