Added installation of WX.
Merge branch 'master' into add_wx_to_travis
Merge branch 'master' into add_wx_to_travis
Merge branch 'master' into add_wx_to_travis

# By Jonathan Rocher (13) and others
# Via Jonathan Rocher (14) and others
* master: (38 commits)
  Added a comment to explain the need for the new pip install PIL
  fix travis config for seamless PIL installation
  Fix one more isinstance case.
  Use isinstance instead of __class__.
  PEP8 fixes to test.
  Trivial clean up of unit test.
  Update CHANGES.txt
  Add test cases that provide basic code coverage and simple rendering validation.
  Restore optimized marker rendering in special cases.
  Add to CHANGES.txt
  Improve the style of the example somewhat.
  Add example which demonstrates issue (works in this branch, fails otherwise).
  Adding change for asynchronous_updates.py.
  Fixing typo.
  Clarifying dependent package requirements.
  Adding new demo to demo.cfg.
  Providing a better title.
  Fixing erroneous method name in documentation.
  Creating demo showing how to use an asynchronizer with chaco.
  Update the mailing list from chaco-users to enthought-dev.
  ...
Merge branch 'enh/coverage-report-on-travisci' into add_wx_to_travis

* enh/coverage-report-on-travisci:
  add the coverall badge
  fix end of file
  exclude all test code from the report
  add a coverage configuration and update travis-ci build to use coveralls
  factor out a requirements file
first attempt at combined wx and qt tests
do not run ui tests when running on python 2.6
remove unecessary variable set
Merge pull request #142 from enthought/add_wx_to_travis

Added installation of WX.