Add a unit test while comparing conflict resolution behavior against couchbase-lite-android

https://github.com/couchbase/couchbase-lite-java-core/issues/106
Merge pull request #302 from couchbase/delete_conflict_test

Unit test regarding conflict resolution behavior
Removed support for “_conflicts” property in doc passed to map blocks.

It didn’t work quite right (could miss some conflicts) and taking it out speeds up
view indexing a little bit.
Developers who want to find conflicts should use an allDocs query with the
only-conflicts option instead.
Fixes #159
Fix replicator checkpoint issue by making sure checkpoint doc ID stays constant

Memoize the value returned by .remoteCheckpointDocID so it stays the same even
if a setting changes — namely, the -stop method sets _continuous=NO for some reason.
Fixes #301
Safer handling of unexpected revisions returned from _bulk_get

Don’t process such a revision; it’ll cause an exception later.
For #300
Added a unit test verifying revpos changes when attachment is updated.
Updating LICENSE.txt to 2011-12-07 CE License

This is per requirement
CBLT-229: added: LICENSE_enterprise.txt, renamed: LICENSE.txt -> LICENSE_community.txt

Parent must copy appropriate file to LICENSE.txt before calling.

Change-Id: I5028e53392a927d2848c7e04995164eeb3bc5e3c
API Change: Added CBLAuthenticator

Pre-existing CBLReplication auth methods are still present,
but the ones supported by CBLAuthenticator are deprecated.
REST API replication auth works as before.
Added some missing copyright/license comments.
Catch uncaught exceptions in CBLDatabase doAsync etc.

Otherwise GCD tends to kill the process, which means unit testing can’t complete.
Fixes #309
Bumped version number to 1.5 for GA
Comply with EE change for 2014-04-14

This is for packaging only.
CBLT-268:  product version now set to a token, instantiated at build time:

    CURRENT_PROJECT_VERSION = @PRODUCT_VERSION@;
    CURRENT_PROJECT_COMMIT  = @COMMIT_SHA@;

Change-Id: I43bbfeb3452fa25301d1416db87745469e678f8f
Revert "CBLT-268:  product version now set to a token, instantiated at build time:"

This reverts commit ee5212dd5c79c0e40587a55659478d5eb621d01d.
Merge remote-tracking branch 'upstream/master'