Enable TLS 1.2 on some 7.0 devices

Originating from this issue:tangrams/tangram-es#1501

Investigate which devices running 7.0 don't have TLS 1.2 enabled and potentially add support for them like we have done here: #116 

https://issuetracker.google.com/issues/37122132
https://stackoverflow.com/questions/39133437/sslhandshakeexception-handshake-failed-on-android-n-7-0