fix(grunt): Give java 2g of memory

Give the java build process 2g of memory

Author: lgalfaso

lib/grunt/utils.js

@@ -141,6 +141,7 @@ module.exports = {
     shell.exec(
         'java ' +
             this.java32flags() + ' ' +
+            '-Xmx2g ' +
             '-classpath ./components/closure-compiler/compiler.jar' + classPathSep +
             './components/ng-closure-runner/ngcompiler.jar ' +
             'org.angularjs.closurerunner.NgClosureRunner ' +