Added New Files created by Crashlytics Plugin

These are relatively new, the crashlytics.properties file contains the secret and can [alternatively](https://plus.google.com/+AntonioBertucci/posts/S9krjvXfgfm) contain the apikey to rid your repo of the extra strings file.
Minor tweaks
Another tweak
Merge pull request #1232 from thunsaker/patch-1

Added New Files created by Crashlytics Plugin