Fixed example OPF command on README.md; referenced unset environment variable $NUPIC_HOME
Merge pull request #35 from dbrody/updated-README-OPF-link

Fixed example OPF command on README.md; referenced unset environment variable $NUPIC_HOME
Adds environment setup script to installation.
Merge pull request #38 from scottpurdy/master

Adds env.sh to install
Adds region unit test.
Merge pull request #39 from scottpurdy/master

Adds region unit test