host routes api changes squashed

fixes #1937 - Foreman doesn't work well when run on subpath

• request_url is not enough to pass form controller to tftp
  Other variables (like script_name) need to be used from
  controller.url_options to properly generate the path in the PXE template.
• use rails helper to get the path to noVNC source...

fix minor css classes declaration.

[SQL optimizations] - many small optimizations

• Bookmarks have only users, not usergroups
• added caching to the settings table
• removed notice message lookups (we are not really using those)...

[UI] added meta tag headers to support tablet and phone display size correctly

title action buttons as a group.

moved to bootstrap 2.04

fixes #1572

updates UI to bootstrap v2

Adds VNC support within the browser

At first, this allows to view oVirt managed hosts within foreman.