Detect the Python user base properly.
Take care of Powerline installation.
Add default powerline config.
Add editorconfig and file-local modes.
Correct the way that shell files are built.
Set the POWERLINE_CONFIG_COMMAND env var.
Add my own themes for Powerline.
Disable old prompt when Powerline is found.

Also fix some Python 2/3 and build issues.
Add pyenv and rbenv support to Powerline.
Add zpython for Homebrew.
Add some Unicode icons for pyenv/rbenv versions.
Modularize the Waf build script with Waf tools.
Improve gitignore.
Remove all default Powerline files and JSON keys.
Allow commented JSON files; revise install process.
Add appropriate coloring for rbenv/pyenv.
Fix up editorconfig for cjson.
Make a comment on why we kept last_pipe_status.
Show whether our VCS branch is dirty.
Add option to explicitly disable Powerline.