Added fontpatcher.

I've added a modified version of the font patcher from the original vim-powerline project. This version uses the new glyph codes for patching the fonts. In other words this version of the script creates patched fonts that use the new glyph codes so that the fonts are compatible with vim-airline the new python based powerline and all other utilities that use the new powerline glyps. I've never managed to get the glyps align properly using the fontconfig method, but using this I get almost perfect glyph alignement.