Remove the Makefile and replace the submodule update with a grunt tas…

…k. Thanks to @ryanneufeld. Closes gh-953.

grunt.js

@@ -7,6 +7,9 @@
 
 /*jshint node: true */
 /*global config:true, task:true, process:true*/
+
+var child_process = require("child_process");
+
 module.exports = function( grunt ) {
 
 	// readOptionalJSON
@@ -379,22 +382,29 @@ module.exports = function( grunt ) {
 		});
 
 	grunt.registerTask( "submodules", function() {
-		var done = this.async();
+		var done = this.async(),
+			// change pointers for submodules and update them to what is specified in jQuery
+			// --merge	doesn't work when doing an initial clone, thus test if we have non-existing
+			// submodules, then do an real update
+			cmd = "if [ -d .git ]; then \n" +
+				"if git submodule status | grep -q -E '^-'; then \n" +
+					"git submodule update --init --recursive; \n" +
+				"else \n" +
+					"git submodule update --init --recursive --merge; \n" +
+				"fi; \n" +
+			"fi;";
 
 		grunt.verbose.write( "Updating submodules..." );
 
-		// TODO: migrate remaining `make` to grunt tasks
-		//
-		grunt.utils.spawn({
-			cmd: "make"
-		}, function( err, result ) {
-			if ( err ) {
+		child_process.exec( cmd, function( err, stdout, stderr ) {
+			if ( stderr ) {
+				console.log(stderr);
 				grunt.verbose.error();
-				done( err );
+				done( stderr );
 				return;
 			}
 
-			grunt.log.writeln( result );
+			grunt.log.writeln( stdout );
 
 			done();
 		});