Update apns-conf.xml

The StraightTalk T-Mobile has incorrect MMSC server, it should be http://mms.tracfone.com not mmsC
PA 3.5 +++HALO+++

Change-Id: Iab9f8ba15d6c398e9211c17df79e99b4b23ecff3
Merge pull request #57 from mastermind278/patch-1

Update apns-conf.xml
Add d710 support

Add support for the SPH-D710 (Epic 4G Touch)
Merge pull request #61 from Sniper-/d710

Add d710 support
Merge remote-tracking branch 'upstream/jellybean' into HEAD