Fixes Crashlytics for Maven/IntelliJ builds

* Updates crashlytics dependency to version [1.1.10,)
* Adds crashlytics-maven plugin

Building the app in IntelliJ IDEA requires installing the Craslytics plugin available here:

https://crashlytics.com/downloads/intellij
Merge pull request #47 from mapzen/crashlytics-maven

Fixes Crashlytics for Maven/IntelliJ builds