Add seed data

These seed data are useful during development, especially when working
with the UI and you don't want to deal with the overhead/hassle of
setting up actual nodes to manage.

Load them by running `rake db:seed`.
Add Bootstrap Javascript

Overlooked this in the earlier commit to when adding the Bootstrap CSS.
We need this for the Javascript actions (eg. closing the dialogs,
notifications) to work.
Use Rails' Asset Pipeline/Sprockets to load independent stylesheets

Use the `//= require` directive to load stylesheets whenever possible,
so that it is included individually when in development mode. This makes
CSS development and debugging a lot easier.

It's not possible to use this all the time though, as each stylesheet
required this way is given its own scope, so variables and mixins
defined in other stylesheets won't work.
Style buttons via bootstrap

  * Visually they are the same as before
Style the login page

 * Quite a lot of changes to the template
Layout and sign-in page to bootstrap templates
Begin table styling
Merge branch 'kwwii-bootstrap-buttons' of https://github.com/kwwii/barclamp-crowbar into kwwii-bootstrap-buttons

Conflicts:
	crowbar_framework/app/assets/stylesheets/application.sass
	crowbar_framework/app/views/dashboard/index.html.haml