sync_gateway 1.0.2 (new formula)

sync_gateway provides the syncing backend for couchbase mobile and is
used together with couchbase-lite-ios or android to develop syncing apps
for iOS or android.

Since the project itself is named sync_gateway I kept the name for the
formula as well.
sync_gateway: add 1.0.2 bottle.

Closes #29736.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Use bundler for test gem dependencies.
sync_gateway: update 1.0.2 bottle.