Make change-tracker not stop on errors, in continuous replication

For #108
Make continuous replicators retry after errors

Fixes #108
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.
Don’t send atts_since param on pull, if doc doesn’t have attachments

The list of revs in that param can get pretty lengthy, so it’s a good optimization
to skip it if it’s not needed.
Made +[CBLJSON dateWithJSONObject:] about 30x faster

...by using C code excerpted from sqlite3 to parse ISO-8602 date strings,
instead of NSDateFormatter.

Also added a new +absoluteTimeWithJSONObject: that returns the time-
stamp as a double (time since reference date), which is even faster
since it doesn't have to allocate an NSDate object.

Thanks to @nirvana for suggesting this to me, and for @AnuragMishra
for initially discovering how much faster sqlite is!

Fixes #122
CBLT-44:  add community license 2012

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

Change-Id: I5961b20df6831d0611727c20bcf9bfd7d7a3e1f8
Fixed some integer-size build issues.
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
Update README.md
Update README.md
Update README.md
Added some code-coverage testing to CBLCollateJSON & fixed test holes
Fix for replication never going idle after checkpoint-save conflict

Fixes #128
Updated MYUtilities
Replications created by -replicateWithURL:exclusively: should be continuous