The glyphs that were added by fontpatcher.py were not positioned
correctly.  This was most noticable for the triangular separators. To
correct the glyphs I used the following modifications to fontpatcher.py:
- y_ratio *= 0.96
- y_diff += 300
The values are based on trial and error and what "looked" right, so
there is probably still room for improvement.

Customized version from Apple's Menlo font:
https://github.com/andreberg/Meslo-Font

To use it edit your ~/.vimrc and add

  set guifont=Menlo\ Regular\ for\ Powerline

Closes #1.