matplotlib Code

Removed unused imports.

table_demo working. Lots of minor fixes. Faster transforms when
debugging is turned off.

First pass through all of the examples -- not all working yet,
though. (See PASSED_DEMOS).

Removed transforms on the C++ side -- removed many methods that depend
on it in backend_agg in preparation for path generalization.
Lots of general renaming...

Second pass, using a stateful transform tree.

Baby steps and horrible breakage on transforms branch.

Creating branch to work on transforms/projections refactoring.