[CLC-1235] Exposing the bDrive badge

JIRA: https://jira.media.berkeley.edu/jira/browse/CLC-1235

This is dependent on CLC-1350, which I have a branch sitting by with the changes to the Google OAuth scope, which subsequently requires us to revoke the old tokens since Google will issue a new one (an operations task that will have to be carried out on our different slices).

- Also implemented a backwards 6 month window for drive files (i'm assuming files unread after 6 months probably shouldn't be very relevant). 

Here's the bamboo build: https://bamboo.media.berkeley.edu/bamboo/browse/MYB-CLCMVPYUHUNG11-5