syntax error and get_redis_link method
- Added docker support. The image will download the redis git repo, build it and run 6 nodes in cluster mode.
 - Added Makefile to make it easier to handle the docker image
 - Added some infrastructure files for the docker image.
Added more commands (From https://github.com/desprezj/redis-py-cluster/commit/4568ede42b96a496b1a9bb5593b3a33d5b295d87)
Renamed README.rst to README.md
Converted from .rst format to .md format in README.md
Added new supported commands to README
Merge branch 'update' of git://github.com/dobrite/redis-py-cluster into dobrite-update
Change default port to 7000 to match the port used by Dockerfile
Point explicitly to RedisCluster class variable
Changed all instances of xrange to range
Added comments to most functions