I try to integrate Fabric/Crashlytics via CocoaPods, my Podfile looks like this:
pod \'Fabric/Core\', \'1.2\' pod \'Fabric/Crashlytics\', \'1.2\'
If you update to Fabric & Crashlytics from older version:
Fabric
Crashlytics
info.plist
"${PODS_ROOT}/Fabric/run"
That worked for me, hope this helps.