Compilers: Improved Results architecture

* Compilers: Improved Results architecture
(for NodeExecutorBase)

* Regex based and JSON based results.

<ul><li> Related issues:
<ul><li>
less/less.js#1776</li><li>
jashkenas/coffee-script#3303</li><li>
madskristensen/WebEssentials2013#392</li></ul></li></ul>