Fixes issue #292 (Dashboard Re-skin: System and Settings > Permissions and Access > Maintenance Mode)

OK. Sorry for the duplicate. I closed the previous PR in order to sort out my own stuff.  I've forked the repo and then branched before writing code which should allow me to work on other things without my conflicting.

In short:
- footer buttons wrapped with divs with ccm-dashboard-form-actions-wrapper and ccm-dashboard-form-actions
- BS3 styles over BS2
- removed unnecessary divs
- changed submit button to be btn-success rather than primary (grey -> green)

If theres anything else, let me know.