Found a bug with priority-based banner hiding

We were giving each banner a minimum of one slot, even when the allocation had
been calculated as true zero.

Change-Id: Ic5c2dfa6f41d56b04626c6041326593a3ffbc3c2
Localisation updates from http://translatewiki.net.

Change-Id: I641bc4c0553965a86c48048c45ca5c9fe2fda255
Serve Mobile URLs to Mobile Users

This seems to work but I'm having a heck of a time actually
testing it. So -- to the beta cluster :)

Bug: 55860
Change-Id: I56c5025fac4bfa23944f104b149fadcff6a2d43f
Merge "Serve Mobile URLs to Mobile Users"
Merge "Found a bug with priority-based banner hiding"
Localisation updates from http://translatewiki.net.

Change-Id: Iae04b24820805c1fc48060adc33cac6d5f8dfb65
Merge remote-tracking branch 'origin/master' into wmf_deploy

* origin/master:
  Localisation updates from http://translatewiki.net.
  Serve Mobile URLs to Mobile Users
  Localisation updates from http://translatewiki.net.
  Found a bug with priority-based banner hiding

Change-Id: Ib3a6755b36e866eea33905a43fcae2efe4d60bc7