fix(build): Vendor files were added 2x to build

Closes ngbp#69.

Author: Josh David Miller

Gruntfile.js

@@ -180,7 +180,6 @@ module.exports = function ( grunt ) {
           '<%= build_dir %>/src/**/*.js', 
           '<%= html2js.app.dest %>', 
           '<%= html2js.common.dest %>', 
-          '<%= vendor_files.js %>', 
           'module.suffix' 
         ],
         dest: '<%= compile_dir %>/assets/<%= pkg.name %>-<%= pkg.version %>.js'