adding rolling upgrade document
adding app.config details
fixing title
Fixing compatibility link
fixing compatibility link again
fixing typos and alignment
generalizing cs_version
fixing some typos
Fixing doc link
changed version number to 1.2+
Adding Rolling Upgrades link to sidebar
Changed wording of backup section
Clarying EE on package name change
Consolodating steps into one group with platform-specific details
Merge pull request #346 from basho/riak-cs-rolling-upgrades

Riak CS Rolling Upgrades Document