tests: Travis run all examples code

almost all examples are run
Travis will take longer, but more careful functionality checks
tests: ignore on test due to missing dep.

tkinter is missing in Travis, see
http://wiki.python.org/moin/TkInter
Merge pull request #105 from breznak/travis-run-examples

tests: run all examples code
Merge branch 'master' of github.com:numenta/nupic