Merge pull request #1 from CocoaPods/master

Update
Merge branch 'master' of https://github.com/CocoaPods/Specs
Merge branch 'master' of https://github.com/CocoaPods/Specs
Added AdMob without UDID requeriment
Merge branch 'master' of https://github.com/CocoaPods/Specs
Fixing Admob podspec to be compatible with Ruby1.8
Merge pull request #2680 from patoroco/master

Added AdMob 6.4.2 without UDID requeriment