Add aliases and commands rgrep, clean, and django-subcommands

rgrep -- Recursively grep through the non temporary (~) files in a directory
clean -- Delete all the temp (~) and compiled (pyc) files in a directory
django-subcommands -- Tab completion for django-admin comands
Add a dummy Django settings file to pygedit so that Django modules can be opened
Use rvm instead of rbenv
Add a command to watch files in a folder and run a command when they change
Add a python requirements file for local bin files