Shows cmake version.

Fixes #899
Default directories structure (python standard)
$NTA replaced by $NUPIC
Setup.py, Travis, CMake and Readme updated
Fixed nupic.rootDir
Replaced 'examples' to 'share' when appropriate
Download, build, and install python, setuptools, pip, and nupic python
dependencies from scratch in order to build nupic following recent changes to
Travis-CI
Merge pull request #906 from oxtopus/901-travis-cmake-errors

Update NuPIC Travis-CI config
Merge branch 'master' of github.com:numenta/nupic into cmake-version

Conflicts:
	.travis.yml
Updated comment
Replaced relative to absolute path in experiments
Merge pull request #900 from rhyolight/cmake-version

Shows cmake version.
Default directories structure (python standard)
$NTA replaced by $NUPIC
Setup.py, Travis, CMake and Readme updated
Fixed nupic.rootDir
Replaced 'examples' to 'share' when appropriate
Replaced relative to absolute path in experiments
Solved conflicts with Travis
Replaced build_ext to build_py (build_ext is only called if explicitally we include extensions)