Switched from browserify to pure-cjs bundler.
Optimizations and fix for JSXTransformer build.
Dropped dependency on emulation of Node.js native modules.
Added deamdify step for JSXTransformer build.
Renamed `browserify` tasks/configs to `cjs`, updated pure-cjs to 1.9.0 for better build speed.
CommonJS builder config to Grunt style for easier handling and readability.
Renamed commojs task to bundle, added failing build if bundler failed.
Merge pull request #1234 from RReverser/pure-cjs

Switched from browserify to pure-cjs bundler.