Fix Ruby sample code so it works on Sauce Labs

Add Android cucumber example

Fix #1458
Fix error handling in installApp
Merge pull request #2727 from bootstraponline/ruby_sample

Fix Ruby sample code so it works on Sauce Labs
Merge pull request #2729 from imurchie/isaac-installapp

Fix error handling in installApp
Remove emma/ant coverage doc

jacoco/gradle is the official way to get coverage from Android.
https://code.google.com/p/android/issues/detail?id=60964