MPL fix and __file__ setting

This release introduce:

• the setting of the co_filename slot on code objects retrieved from cache files. This follows the pattern used by Python itself and allow to include enamlc in conda package while ignoring the build prefix inside the files (see build_tools docstrings for more details.
• fixes a bug in MPLCanvas introduced in #14

Compatibility fixes

• Fix loading of source files under Python 2 #32
• Fix imports for Matplotlib widget #14 provided by tacaswell
• Fix imports for IPython qtconsole to be compatible with IPython > 4.0 #29 #30
• Automatically install and byte compile enaml files. Setuptools command can
  be used in other projects see doc of build_tools module #28

Improve unicode support

• Fix handling of b-strings under Python 3 #18
• Fix handling of source file encoding #18
• Fix handling of generic unicode string #18
• Fix handling of unicode identifiers #18
• Add a hotspot attribute to base widget used for dragging #17
• Generate lex/parse tabs in setup.py so that they are always up to date and
  correctly removed during unistall (future is now a setup dependency) #23

Python 3 and Qt5 support

0.10.0.dev

fix dumb typo in setup.py