Changing the way target descriptions work from a static mapping to
something that is dynamically generated and is extensible via plugins.
Also moving core target implementation stuff under "framework".
In the process removed modules and boot_strap.py. Also Renamed extensions Plugins.
Louie is now monkey patched rather than containing a modified version in external
On Unix, pip will change current working directory to whereever it has
extracted the downloaded package. On Mac OSX, it does not appear to do
that. To get around this difference, specify paths in setup.py relative
to the location of setup.py, rather than the current working directory.
