Update existing tests

[greenrobot-team]

This closes #2

Updated the following libraries (#8):

• greenDAO to 2.1.0 (on one comparison run, median run times are less than 3% lower, so about the same performance)
• couchbase-lite to 1.2.0 (broken, throws 409 conflict with new transaction API, extracted to Update couchbase test #9)
• cupboard to 2.1.4
• firebase-client-android to 2.5.1 (still OOM issues)
• parse to 1.13 (only has minor fixes)
• realm to 0.88.0 (now also uses annotation parsing with apt, is a gradle plugin)