Switching to Bootstrap, commit #1/many.

This has all the work needed for the landing page, and a good
bit of the work needed for the search results page.
Forgot to add the bootstrap settings file, even though it's empty.
Search document list and dropdowns implemented.
Fix some modals, user registration, library editing.
Fix search controller modals.
Put the submit buttons in the .modal-footer.
Fix right hand filter bar.
Update advanced search form.
Finish updating users controller.
Rework UI for workflow dashboard.
Merge branch 'bootstrap' of github.com:rletters/rletters into origin/bootstrap
Datasets, workflows, job views to Bootstrap.
Some more theming.
Switch from padding to margin.
Fix the couple specs that now fail.
Update features and views for specs and features to pass.
Fix the collapse accordion and related JS.
Update ChangeLog. [ci:skip]
Merge pull request #86 from rletters/bootstrap

Migrate from Foundation to Bootstrap