Centos & Ubuntu support, Riak Control, OS Tunings
Added some Riak Control screenshots, added Riak Control instructions
Fixed some md formatting issues
Added limit changes
Merge commit '701d754f0b5a2c26d310d7798c1a11ea06510697'

# By Jon Glick
# Via Jon Glick
* commit '701d754f0b5a2c26d310d7798c1a11ea06510697':
  Added limit changes
  Fixed some md formatting issues
  Added some Riak Control screenshots, added Riak Control instructions
  Centos & Ubuntu support, Riak Control, OS Tunings