make the local sync_gateway use walrus

for testing we don't need a couchbase server, use walrus for it
move to ruby based view blocks

with the recent updates to couchbase lite and rubymotion it is now
possible to use blocks defined in ruby as view indexes. This lets us get
rid of all the cruft from setting up the blocks via ObjC in an embedded
project.

- Remove the Blocks sub-project
- update couchbase-lite to 1.0.3
- define the view index blocks in ruby
- ... be happy!
use the new sync-gateway shared by all the todo apps
Merge pull request #2 from sideshowcoder/move_blocks_to_ruby

Fix #1