Bug 927320 - 1/2: rename TelephonyProvider to TelephonyService. r=aknow

--HG--
rename : dom/telephony/gonk/TelephonyProvider.js => dom/telephony/gonk/TelephonyService.js
rename : dom/telephony/gonk/TelephonyProvider.manifest => dom/telephony/gonk/TelephonyService.manifest
rename : dom/telephony/ipc/TelephonyIPCProvider.cpp => dom/telephony/ipc/TelephonyIPCService.cpp
rename : dom/telephony/ipc/TelephonyIPCProvider.h => dom/telephony/ipc/TelephonyIPCService.h
rename : dom/telephony/nsIGonkTelephonyProvider.idl => dom/telephony/nsIGonkTelephonyService.idl
rename : dom/telephony/nsITelephonyProvider.idl => dom/telephony/nsITelephonyService.idl
Bug 927320 - 2/2: rename related variables. r=aknow,btian