CR for the current updates script

[srcreigh]

@hackthenorth/commiters @snario

The code I've written to write updates to Firebase and send off notifications to users via GCM is mostly finished, except for a few TODOs for GCM and the fact that we don't have automated tests yet.

It'd be sweet if someone could read it over. Any feedback is welcome, but mostly I just want to make sure that there isn't anything that doesn't make sense, even if you don't know how GCM works.

[KartikTalwar]

check comments in commit messages

[srcreigh]

Thanks, Kartik. We'll likely work through more kinks as others start using this script.