Merge pull request #12 from ent-worm/master

Add option to use mysql_server as hive_metastore
Cherry pick from amirhhz's branch. Included other fixes and CDH 4.6 changes.
ES 1.0.1. [ci skip]
Since we're no longer using accellerated
Presto fix.
Further cleanup and debian wheezy support, picked from @coderfi 's branch, thanks!
Fixed wrong keys.
Cosmetics. [ci skip]
Fix #9 and some other fixes.
Fix hive_metastore db install. [ci skip]
README. [ci skip]
Ansible performance tweaks. [ci skip]
Fix curator install to work with ES 1.0.0 and up. [ci skip]
Add datanode exclusion to decommission machines without losing HDFS integrity. Cherry pick from  Prokopp branch.
Ignore errors when refreshing nodes.
Use ansible_distribution. [ci skip]
Upgrade the kernel to 3.13.5. Defaults to no. [ci skip]
Don't upgrade kernel if already on 3.13.
Move hive_metastore to defaults. [ci skip]
Implicit localhost (Ansible 1.5).