sync_gateway: 1.0-beta2 - couchbase mobile sync

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.
fix code style
updated to beta3
SyncGatway has been released

This is now version 1.0.0, still needs git since it relies on
submodules, but is released
sync_gateway: add gateway bottle.