Fix typo.

Update merge function, add more documentation.

Update documentation to reflect API changes.

API changes: rename first/start to lower and last/end to upper to conform to PostgreSQL.

Fix version.

Fix.

Drop Python 2.6 support.

Future compatibility.

Fix tests for Django 1.6

Support copying fields from existing table.

Fix tests, set USE_TZ = True

Various fixes.

Fix: merge records which may contain null keys properly.

Added test cases for mismatched update (instead of leaving record alone).

Fix: null keys didn't match when merging.