- https://github.com/Lokaltog/vim-powerline/tree/develop/fontpatcher
- https://powerline.readthedocs.org/en/latest/fontpatching.html
- http://sourceforge.net/projects/fontforge/files/fontforge-source/
- https://github.com/Lokaltog/powerline-fonts
- http://www.v2ex.com/t/73388
- http://ruby-china.org/topics/13368
- http://files.cppblog.com/runsisi/powerline_fontpatcher.pdf
- http://hit9.org/oldblog/blog/other/posts/11.html
- https://github.com/erikw/tmux-powerline/issues/150
- http://choorucode.com/2013/02/17/how-to-use-vim-powerline-plugin-in-putty-and-windows/