added context function back

Author: kevinchekovfeeney

lib/woql.js

@@ -976,6 +976,15 @@ WOQLQuery.prototype.getContext = function(q){
 	}	
 }
 
+
+/**
+ * Retrieves the value of the current json-ld context
+ */
+WOQLQuery.prototype.context = function(c){
+	this.cursor['@context'] = c;	
+}
+
+
 /*
 * Transforms from internal json representation to human writable WOQL.js format
 */