Changed scripts so that we can easily no-op them when debugging. There
is a new environment variable, TUNGSTEN_DO_INSTALL.  If it's empty, no
install will occur - all scripts will be no-ops.  Otherwise, install
etc. will occur normally.
Merge branch 'master' of https://github.com/narmitag/openshift-origin-cartridge-tungsten.git
Added new env variable to make it easy to no-op install scripts etc.