Add new color theme: hybrid

Add [Hybrid](https://github.com/w0ng/vim-hybrid) theme!

Wrote this theme based on luna theme.

![hybrid](https://f.cloud.github.com/assets/736506/2168165/7dc4fda0-9531-11e3-9b17-fe0ecaec37f5.png)

Do you like it?
Thank you!