_POWERLINE_CONFIG -> POWERLINE_CONFIG_
Remove annoying usages of format(...).
Move fully to Python 3.
Switch tmuxinator -> tmuxifier in README.
Update todos.
Account for reattach; 'TMUX' -> 'TMUX_'.
Correct writing of paths to conf env for Waf 1.8.
subprocess -> ctx.exec_command, ctx.cmd_and_log
Use Python json module for Powerline config file.

We removed the ugly and error-prone templating in favor of an actual emitter!
Add previously-skipped platform-specific aliases.
Add alias for restart ssh-agent on Mac OS X.
Remove defunct todo.
Make it easier to add nodes to shells.
Add fasd aliases for Emacs and open.