Overhaul ReplicatorTest.m
Overhaul ReplicatorTest.m

* Added kCBLEnableSyncGatewayTest for enabling the tests with SGW.
* Added -eraseRemoteDB:.
* Added failTestPushBlobToSyncGateway.

amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,amco/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios,couchbase/couchbase-lite-ios