Updates the GoogleTagManager podspec to use the 3.02 release, this is to work around a known bug with the Google Analytics SDK 3.00 release and iOS 7 (https://code.google.com/p/analytics-issues/issues/detail?id=338)
Merge pull request #5238 from leah-zumper/GoogleTagManager-3.02

Updates the GoogleTagManager podspec to use the 3.02 release