Merge dev-master into master
Updating README build status image with the one for dev-master, not the global status.
Merge pull request #72 from rhyolight/master

Updating build status image to use dev-master, not the global status
Change build script to take command-line override for installation directory. Also stop exporting the environment variables.
Merge pull request #75 from scottpurdy/master

Change build script to take a command-line override for installation location