Bug 896381 - @1.5x assets update for communcation apps (FTU, Dialer, Contacts), round2

It's almost the same with v1-train one.
Mostly significant differences are:

* Correcting filenames of FTU timezone files.
  (maps.png moved to timezone/ without deleting @1.5x and @2x in original)
* Update some css image-size for master-only layout.