Update base fabfile for config changes.
Install gcc in base (for `pip install twisted`).
Don't create pypy user if it already exists.
Install pip globably and allow picking between pypy and system pip.
Add links to issues for some FIXMES.
More todos, and real issue links.
Rename ~/src to ~/config.
Make bzr always pull from the specified remote.

Refs: #5.
Install bzr by default.
Don't create ~/config by default.

bzr doesn't like branching into an existing directory.
Add list of supported services.
Remove obsolete load_config from utils.
Add a decorator to cache values in fabric's env.
Add some tools for detecting the remote distribution.
Add fedora support to braid.pip.install.
Make pep8 (more) happy.
Ooooupss… making environment shortcuts work again
Give a useful docstring to the generated environment activation functions.
Merge remote-tracking branch 'origin/stuff' into master.
Add users to fabfile.