Contributors: add maintainers for ruby

Change-Id: I245fd1f0d5138e5047d8e1a65b2bb2a7d1b125d3
remove cmupdater (reverse-merged from commit d6ee346322acf5079da68ec8f7e603d65a393b11)
apns: add "phone" APN for AT&T

  * These "phone" provisioned SIM's don't work with the "pta" APN
  * LTE and MMS do work properly with "phone" APN

Change-Id: Iab7b1f441933be12a7a213d047854dd14b479563
Merge remote-tracking branch 'upstream/jellybean' into jellybean
thinner