added "program" plugin to Parser for custom stuff

Author: sokra

lib/Parser.js

@@ -698,7 +698,8 @@ Parser.prototype.parse = function parse(source, initialState) {
 		definitions: []
 	};
 	var state = this.state = initialState || {};
-	this.walkStatements(ast.body);
+	if(this.applyPluginsBailResult("program", ast) === undefined)
+		this.walkStatements(ast.body);
 	this.scope = oldScope;
 	this.state = oldState;
 	return state;