Shows cmake version.

Fixes #899
README updates:

- removed inline OPF examples in favor of links to Using Nupic wiki
  page, which contains examples, tutorials, and screencasts
- replaced ambiguous and non-executable example of running tests with a
  line-by-line runnable example of running tests from make
- added note about anomaly detection capabilities to project
  description
Adding tests_all
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 update-readme
Merge branch 'master' of github.com:numenta/nupic into cmake-version

Conflicts:
	.travis.yml
Updated comment
Merge pull request #900 from rhyolight/cmake-version

Shows cmake version.
Merge pull request #904 from rhyolight/update-readme

README updates:
Merge branch 'master' into issue-887