Bringing in changes to bin/activate from nupic-linux64
Bringing in packages not previously installed into nupic-darwin64
Calculate python version dynamically
Moved externals to lib/python2.6/site-packages, as well as binaries to bin/
Updated dependencies
Makefile for easy re-builds
Updated to include lib64, which is required on Centos linux64
Fixed issue where DYLD_LIBRARY_PATH was not being set correctly
Removed python headers, specify pip install prefix as $NUPIC_ENV
matplotlib-1.1.0 added.

Had to revise PKG_CONFIG_PATH in order to avoid ImportError/Symbol not found errors:

  export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
Merge pull request #1 from oxtopus/NPC-308-Remove_external_python_dependencies

matplotlib-1.1.0 added.
Rename "deactivate" to "deactivate_nupic" to avoid naming conflicts with virtualenv
Re-built nupic requirements following merge of numenta/nupic/pull/294
Merge pull request #4 from breznak/keep-set-variables

Keep set variables