[UI/UX] Add Twitter Bootstrap framework

See http://twitter.github.io/bootstrap/ for details on Bootstrap.

Getting this to work on Rails 2.3 is a little more tricky than in
current Rails (3.x) since it doesn't have Sprockets. We workaround this
by using Compass (http://compass-style.org/) which then allows us to use
bootstrap-sass (https://github.com/thomas-mcdonald/bootstrap-sass).

These asset (CSS, Javascript) compilation-only Gem dependencies don't
need to be included in the product as we can precompile the assets
during build time. But we'll need to modify the code to allow this, or
find another solution.
[UI/UX] Use Bootstrap classes with

 * Main layout
 * Node dashboard
 * Bulk edit
[UI/UX] More Bootstrap styling

 * Finish Node menu styling
 * Styles the Utilities export
 * Main Help/Documentation styling
[UI/UX] Remove condensed table tags

Might reintroduce them in the future, but for now it seems ok.
[UI/UX] Style barclamps menu

Also removes much of old SASS styles.
[UI/UX] Style all presently visible pages

 * Still need to see many nodes to understand the UI and see the
   interface for editing a proposal.
 * Someone needs to look at the copy-writing.
 * I currently cannot created a proposal. There might be problems with
   these interfaces.
[Docs] Fix up the Help navigation and page

 * Site navigation menu should have consistent behavior and bring you to
   pages, rather than triggering PDF downloads. Remove sub-menu items
   and just have a simple page providing the relevant links to both HTML
   and PDF docs.
 * Update external wiki link from the old dellcloudedge Github
   organization to crowbar. Also add warning that external wiki contains
   information for a different version.
 * Remove unused code that generates (incomplete) HTML docs.
 * Remove outdated, Dell specific PDF docs.
 * Add symlinks to SUSE Cloud PDF documentation. Requires the
   susecloud-{admin,deployment,user}_en-pdf RPMs to be installed.
 * Add symlinks to SUSE Cloud HTML documentation. Requires the
   susecloud-manuals_en to be installed.