Revert "Build: Upgrade grunt-html to 6.0.0"

This reverts commit f9e07a3.

Travis doesn't support Java v1.8 yet.

Author: scottgonzalez

package.json

@@ -63,7 +63,7 @@
 		"grunt-contrib-requirejs": "0.4.4",
 		"grunt-contrib-uglify": "0.11.1",
 		"grunt-git-authors": "3.1.0",
-		"grunt-html": "6.0.0",
+		"grunt-html": "4.0.1",
 		"grunt-jscs": "2.1.0",
 		"load-grunt-tasks": "3.4.0",
 		"rimraf": "2.5.1",