add function to check if context has specified context

Author: jrainville

lib/core/plugin.js

@@ -49,6 +49,10 @@ Plugin.prototype.isContextValid = function() {
   });
 };
 
+Plugin.prototype.hasContext = function(context) {
+  return this.currentContext.includes(context);
+};
+
 Plugin.prototype.loadPlugin = function() {
   if (!this.isContextValid())  {
     console.log(this.acceptedContext);