Pusher now sends only the necessary rev IDs in _revisions property

It now looks at the ‘possible_ancestors’ result from the server and omits any revisions from the history that are ancestors of any of those.
This should mean in general that only one a small number of rev IDs are sent; just the number of changes made locally before syncing.
Fixes #119
Make sure CBLJSON gets documented

Also add it (and CBLUITableSource) to CouchbaseLite.h.
CBLT-44:  add community license 2012

Change-Id: Id31f983d0618edb0dc9f4b47b36047106d0411b1
CBLT-44:  add community license 2013

Change-Id: I5961b20df6831d0611727c20bcf9bfd7d7a3e1f8
CBLT-44:  move community LICENSE.txt to "release" sub-directory

Change-Id: Ia9446ce204d94f095cdc8c25d11b500f60c251be
Removing CE License

For source we use Apache 2.0
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CBLT-61:  RESTORE release/LICENSE.txt

Change-Id: If3729fa5b8f2a19e7d659239a559837a656c89d1
Merge branch 'master' into stable

Conflicts:
	Source/CBLJSON.m
	Source/CBL_Pusher.m
Merge branch 'master' into stable
Merge branch 'master' into stable
Merge branch 'master' into stable
Merge branch 'master' into stable
Fixed a crash reporting errors from a CBLReplication

NOTE: This patch was made on the stable branch as a fix for beta 2.
It does _not_ need to be merged into master, because CBLReplicator has
been rewritten since beta 2 and this bug doesn’t exist there.

Fixes #220
Fixed crash closing database when there are unsaved models

Reported on this thread:
https://groups.google.com/d/msgid/mobile-couchbase/33d8a66d-c4b7-47e2-891f-6c7b345df51d%40googlegroups.com
merged from stable