Change tests to use fixture loader rather than direct file paths
Clean up build.gradle and add more functon to test app

More function added to test app - test app now allows a failure to be inspected, so the reason why it failed and any exception stack trace
is displayed to the user.

build.gradle has been cleaned up to remove no longer needed print statements
Merge branch 'run_tests_on_android' of https://github.com/cloudant/sync-android into run_tests_on_android

Conflicts:
	AndroidTest/app/src/main/java/cloudant/com/androidtest/CloudantListener.java
	AndroidTest/app/src/main/java/cloudant/com/androidtest/MyActivity.java