Adding Crashlytics to project
Added build script to inject api key to plist

Fabric doesn't seem to allow us to pass this key in when we initialize it and instead looks for it in the plist file so I added in a step that injects this information in on build.
Fixing build script that injects fabric api key
Having fabric api key only injected for release
Only enabling fabric initialization on release
Merge pull request #5 from Automattic/feature/add-crashlytics

Adding crashlytics