Release v2.3.0

Updates README and changelog and releases version 2.2.4

Updates the cookbook version banner for release

minor cleanup in changelog.

Bumps default redis version to 2.8.13. Releases version 2.2.0

Version bump 1.7.1

Updates redis version to 2.6.17.  Changes redis mirror Updates changelog.

Updates changelog with release date.

Updates readme to add in explanation of the new install_dir attribute

Officially releasing 1.5.0

Updates the readme file with the new cluster options
Forces maxmemory to string inside of install provider to avoid explosions due to use of #include?
Uses .empty? instead of .nil? for maxmemory now that it gets converted to a string

- Bump metadata version and tag