use --zk instead of --zk_hosts
Let main UI use full width of viewport

No sense in scoping it to the max width of .container... the whole thing
scales horizontally just fine since it's a `<table>`. Better full
screen use.
Set `title` on potentially overflowing table cells

This makes hovering table cells expose their full values in case they
are cut off.
use --zk instead of --zk_hosts
Add documentation for planned deployment features
Merge pull request #281 from mesosphere/ui-full-width-hover

UI full width + hover
Merge pull request #274 from asher/p273

use --zk instead of --zk_hosts
Added abdication of leadership on disconnect from the Mesos master. Also reworked the MarathonSchedulerService class to properly handle leadership defeats/elections.