fix mocha's "--compiler" option for CoffeeScript 1.7.x

- fixed mocha's option. because it was using option for CoffeeScript1.6.x
- use CoffeeScript 1.7.x or later, specify in `package.json`
- use coffee&mocha&cake command in `./node_modules/.bin/` , not use global installed them.
- remove node.js 0.6 and 0.8 from test target at TravisCI, CoffeeScript1.7.x not works with them.

## test with CoffeeScript 1.7.1

![](http://gyazo.com/93c6541fdb2ef99a9b0ff1e1125f6510.png)