Requirejs build file

If I give requirejs build file to requireConfigFile property. It will not read config correctly. And I found the parser only accept two style, **requirejs({...})** (can be requirejs, require or require.config) and **var config = {...}**. But requirejs build file allow no *require, requirejs or require.config* in front of the brackets([more detail example](https://raw.github.com/jrburke/r.js/master/build/example.build.js)). So, I add a getObjectLiteral function in parse.js for holding it.