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
Moves model loading to Model base class so it is next to save logic and can be called from model classes.
Merge branch 'master' of github.com:numenta/nupic
Adds cleanbuild script for convenience.
Improve clean up in cleanbuild script.
Allow cleanbuild script to be run from other directories.
Merge pull request #104 from scottpurdy/master

Model.load and CLAClassifierDiff tests
Merge branch 'master' into cleanbuild
Merge pull request #107 from scottpurdy/cleanbuild

Adds cleanbuild script for convenience.
Merge branch 'master' into load_model
Merge pull request #106 from scottpurdy/load_model

Moves model loading to Model base class so it is next to save logic and ...
Merge branch 'master' into streaming
Cleans up CPU usage client and adds a README to the client examples directory.