Use this repo as .openshift that can be submoduled

We don't want to merge this repo with an existing one, since we just
want the .openshift/ dir. Submoduling it into an existing app will allow
us to update this in the future, without dirtying the main app repo.
Update nodejs version to 0.8.23
Add config generator script for pump.io
Update build hook with pump.io specific stuff

* Ensure databank-mongodb is installed
* Ensure there is a config file (call generator script)
* Ensure the uploaddir exists
Export HOME so config file can be found