Restructure repo for Google Fonts

[justinpenner]

I'm preparing this repo for submission to Google Fonts (see gf-structure branch).

TODO

• Set up config.yaml
• Update license file to GF format
• Add meta patch to make build
• Add fix-italic-angle.py patch to make build
• Update .gitignore to ignore venv and fontbm folders, and anything else that is generated/added after cloning the repo.

Extras

• Include bitmap fonts in the repo (built by fontbm)
• Write build script for building bitmap fonts
• Add bitmap font build instructions to readme
• Python script for subsetting to only include 8x8 glyphs (still supports English and many African languages, but most European languages require the 8x13 version).