Cleaned up wording and enabled word wrapping before adding 1.4 specifics.
Fence old screencast on Control to pre-1.4.
Added Riak Control 1.4 changes:

* Staged cluster management view
* Node management view
* Updated screenshots

I also added version guards for pre and post 1.4.
Passive to active voice. Also, made link to configuration files shorter.
Added Riak Control to the global navigation.
Merge pull request #462 from basho/hc-riak-control

Update Riak Control page for 1.4.