Fix all reserved name issues (fixes #34)

Many of font families, licensed under the SIL Open Font License with reserved font name, should be renamed to avoid possible copyright infringement.

I've made these change to fix this issue:
* Rename **Anonymous Pro for Powerline** to **Anonymice Powerline**
* Rename **Liberation Mono for Powerline** to **Literation Mono Powerline**
* Rename **Source Code Pro for Powerline** to **Sauce Code Powerline**
* Rename **Terminus for Powerline** to **Terminess Powerline**

The Menlo fonts had been removed because of license issue, too.

I also added a font catalog in the REAME file to eliminate any confusion.