DATAREDIS-292 - Prepare release 1.3.0 M1.

Update release notes, changelog and readme.

Original pull request: #61.
DATAREDIS-292 - Release version 1.3.0.M1.
DATAREDIS-292 - Prepare next development iteration.
DATAREDIS-293 - JedisConnection, allow bulk addition with same score.

Prepare issue branch.
DATAREDIS-293 - JedisConnection, allow bulk addition with same score.

Added version check for jedis library as the operation had been introduced in 2.4.

Original Pull Request: #63