[TIMOB-14698] 3_1_X iOS: Adding the new iPad icons.

Adding two new icons appicon-76 &76@2x 
__Testing Instruction__

* According to apple in iOS 7 all we have to do include all the icons needed in the build project and include them in the CFBundleIconFiles inside info.plist

steps.
* Import this [project](https://dl.dropboxusercontent.com/u/43336767/icontest.zip) into studio
* Build for device.
* Find the build .ipa ,rename it to .zip and open it up.
* Check to verify that all the icons are inside the build folder
* Check to verify that all the icons inside the build folder are mentioned inside the <CFBundleIconFiles> inside info.plist