DATAMONGO-690 - Prepare 1.3 M1 release.

Upgraded to Spring Data Build 1.1.RELEASE, Spring Data Commons 1.6 M1. Switched to milestone repository. Updated changelog. Refer to latest docs from Spring Data Commons.
DATAMONGO-690 - Release version 1.3.0.M1.
DATAMONGO-690 - Prepare next development iteration.