Update Straight Talk ATT MMS proxy

Using proxy.mvno.tracfone.com should also future proof it if they change the
IP again. proxy.mvno.tracfone.com resolves to (66.209.11.32)

Change-Id: I8cb5b3ce473bef1369ec4ee313759258fc1172d3
add bash completion script for repo

From Chromium [1]

[1] http://git.chromium.org/gitweb/?p=chromiumos/platform/dev-util.git;a=blob_plain;f=host/repo_bash_completion;hb=master

Change-Id: If246a455244505b26f854ba83d662341d9353592
Merge remote branch 'cm/cm-10.1'