Remove trailing whitespace
Remove "Successfully created proposal" flash

This is visually disturbing, and since it looks similar
to the "Successfully applied proposal" message we had a customer
confused by it already. Just remove it.
Add support for Windows Server 2012 R2
Merge pull request #1105 from vuntz/win2012r2

Add support for Windows Server 2012 R2
Merge pull request #1124 from dirkmueller/no_successs

No successs
Initial support for provisioning SLE12 nodes
Correctly sort the list of available platforms

Here's how we sort it:
  - first the default platform (since it's the default)
  - then linux platforms, alphabetically sorted (and with higher
    versions first)
  - then Windows, with higher versions first
  - finally Hyper-V, with higher versions first
Merge pull request #1128 from rhafer/vuntz-sle12

Initial support for provisioning SLE12 nodes
add .sass-cache dir to gitignore

A lot of files are generated in crowbar_framework/.sass-cache when
running the tests locally. These can be ignored.
Merge pull request #1130 from mapleoin/sass-cache-ignore

add .sass-cache dir to gitignore
Make cluster methods callable on ServiceObject class
Clusters navigation

Add clusters navigation to toplevel menu. Hide it if there are no
clusters defined.
Do not cache available_clusters

Displaying the clusters menu item would break if the pacemaker proposal
is deactivated.

FIXME: investigate if this is needed.
Add translation for clusters title
Add helper methods for getting cluster nodes and roles

FIXME: talk to @vuntz to check if this can be done more efficiently.
First shot at clusters view
Add method for proposal lookup to role object
Make sure that the RoleObject.elements always returns a hash
Replace the table w/ two vertical div lists
Move links to partials