fix(build): Fixes Grunt Task not Publishing

The grunt task wasn't publishing to the bower repo because
of a file not existing.

lib/grunt/plugins.js

@@ -175,7 +175,6 @@ module.exports = function(grunt) {
     grunt.task.requires(['build']);
 
     var options = this.options({
-      stableSuffix: '',
       unstableSuffix: '-unstable',
       cleanup: false
     });
@@ -229,7 +228,7 @@ module.exports = function(grunt) {
         }
 
         // Skip file if it was already released
-        var re = new RegExp('(' + options.stableSuffix + '|' + options.unstableSuffix + ')');
+        var re = new RegExp('(' + options.unstableSuffix + ')');
         if (basename.match(re)) {
           grunt.log.writeln("Skipping file: " + f);
           return;