Add modules for OAuth

Should configure it as described here:
https://github.com/mixmarket/passport-drupal#drupal-configuration

Change-Id: I92e1088c30f2ccee97bcc3563fe85d42811b3c6b
One TY translation.

Change-Id: Icc9a65ee0a7bd447db044d5f1692fc8d8b7e49f7
Merge "Add modules for OAuth"
Matching gifts added to the English letter again

Change-Id: Ic3fb0bae0f4595da92937fdf6a74980ebfa5cb99
Call exchange_rate_convert with timestamp, not time

Change-Id: Iefcfd9d22c81807be882f59c5bebdafc911145a4
Merge "Call exchange_rate_convert with timestamp, not time"
Merge remote-tracking branch 'origin/master' into deployment

Change-Id: I44063f6c659db61b5c5abe28fe32a4469cd2693e