Switched from browserify to pure-cjs bundler.
More optimizations and fix for JSXTransformer build

* Dropped dependency on emulation of Node.js native modules.
* Added deamdify step for JSXTransformer build.
Removed redundant uglification
Removed uglification for separate files since it significantly slowed down build (browserify:min became 26 sec instead of 110, same for :addonsMin) while gave economy in ~70 bytes for min+gz version.
Merge pull request #1002 from RReverser/pure-cjs

Switch from browserify to pure-cjs bundler.