Build: Allow to pass browserSets & jQuery version to testswarm task

So far, Migrate has been tested only on browsers supported by jQuery 2.x.
This commit changes the configuration so that different browserSets can
be tested with jQuery 2.x and 1.x.

Closes jquerygh-59

Author: mgol

Gruntfile.js

@@ -28,18 +28,24 @@ module.exports = function(grunt) {
 			"src/event.js",
 			"src/outro.js"
 		],
-		tests: [
-			"dev+git",
-			"dev+git2",
-			"min+git",
-			"min+git2",
-			"dev+2.0.3",
-			"dev+1.10.2",
-			"dev+1.9.1",
-			"dev+1.8.3",
-			"dev+1.7.2",
-			"dev+1.6.4"
-		],
+		tests: {
+			1: [
+				"dev+git",
+				"min+git",
+				"dev+1.11.1",
+				"dev+1.10.2",
+				"dev+1.9.1",
+				"dev+1.8.3",
+				"dev+1.7.2",
+				"dev+1.6.4"
+			],
+			2: [
+				"dev+git2",
+				"min+git2",
+				"dev+2.1.1",
+				"dev+2.0.3"
+			]
+		},
 		banners: {
 			tiny: "/*! <%= pkg.name %> <%= pkg.version %> - <%= pkg.homepage %> */"
 		},
@@ -108,14 +114,21 @@ module.exports = function(grunt) {
 	grunt.registerTask( "buildnounit", [ "concat", "uglify", "jshint" ] );
 
 	// Testswarm
-	grunt.registerTask( "testswarm", function( commit, configFile ) {
+	grunt.registerTask( "testswarm", function( commit, configFile, browserSets,
+			jQueryVersion ) {
 		var jobName,
 			testswarm = require( "testswarm" ),
 			runs = {},
 			done = this.async(),
 			pull = /PR-(\d+)/.exec( commit ),
 			config = grunt.file.readJSON( configFile ).jquerymigrate,
-			tests = grunt.config("tests");
+			tests = grunt.config( "tests"[ jQueryVersion ] );
+
+		browserSets = browserSets || config.browserSets;
+		if ( browserSets[ 0 ] === "[" ) {
+			// We got an array, parse it
+			browserSets = JSON.parse( browserSets );
+		}
 
 		if ( pull ) {
 			jobName = "Pull <a href='https://github.com/jquery/jquery-migrate/pull/" +
@@ -145,7 +158,7 @@ module.exports = function(grunt) {
 				name: jobName,
 				runs: runs,
 				runMax: config.runMax,
-				browserSets: "popular-no-old-ie",
+				browserSets: browserSets,
 				timeout: 1000 * 60 * 30
 			}, function( err, passed ) {
 				if ( err ) {