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
Merge branch 'mmm-fixes' of https://github.com/breznak/nupic into mmm-fixes
build: fix variable /tmp

used only once, so make hard-coded
as in comment
build: avoid (potentialy dangerous) rm -rf on $NTA

As the $NTA is supposted to be user specified (messed up with), do NOT
remove all data in this path.
Rather print a warning.
Just lost a night worth of local commits..so that's why.