matplotlib Code

Fix a doc typo.

Fix a couple of docstring typos.

Change backend_wx function to backwards-compatible alias

added missing coverage report to backend driver

fix backend driver typo

commented out wide unicode line in stix example until we have a conditional check for wide char support

Fix PolyCollection sizes kwarg docstring

fix bug where reduce_C_function was being misapplied in hexbin()

Add contains method to QuiverKey

Added optional C and reduce_C_function arguments to axes.hexbin().