Refactor

- [x] install script
- [x] build script
- [x] tests
- [x] core
   - [x] Use NAN
   - [x] Remove Coffee dep
     - [x] Core JS lib
     - [x] helper lib (args.coffee)
- [x] change README

**TODO:** (sseparate issue)
* 0.11 support from v0.19
* examples and documentation
* promise api