Clean up routes. Remove dead code. PageController -> RenderedController.
Use --browser instead of --open, make it the default, and update routes.py
Replacing the google apputils with docopt.

Breaking the grow CLI into separate, dedicated files to make it easier to update and read.
Fixing the WSGI app to no longer use gflags.

Added a --debug flag to the run command that runs the server in debug mode.
Moving the `multiprocessing` to the sub commands to fix hanging commands.