Fix some highlighting issues of coffee-mode

I fixed some highlighting issues of coffee-mode.

Update

You can update coffee-mode from MELPA

Fix invalid keyword highlighting

coffee-mode highlighted property name whose name equals to keyword
by mistake. For example 'on' in 'foo.on' is highlighted.

Original

https://f.cloud.github.com/assets/554281/1846691/cb5286d0-7611-11e3-97ff-27725df27a50.png

Fixed

https://f.cloud.github.com/assets/554281/1846692/cdf47eca-7611-11e3-9fd1-973e8acb107a.png

Fix invalid block comment highlighting

Original

https://f.cloud.github.com/assets/554281/1865198/8449ef28-7808-11e3-8e6d-585ffe16ad97.png

Fixed

https://f.cloud.github.com/assets/554281/1865200/8855fe4a-7808-11e3-9da4-f1ce0170ed05.png

Conclusion

I fixed some highlighting issue of coffee-mode.
Please report me via github issues, if you have problems or suggestions.