Fixed save and cancel buttons to always be at the bottom of the form.

Redmine #4433
Fixed navigation bar display with reduced screen width.

Redmine #4445
Fix bugs.

Remove permission denied error when editing action items.
Remove error when sorting by 'done'.
Change 'Comment' to 'Reply'.
Delete action item created in test
Merge pull request #179 from daniell/action_item_bugs

This fixes some bugs in the action items functionality. It includes the fix in pull request #178, making that request obsolete.
Merge pull request #174 from martinburchell/navbar_shrink

Navbar shrink
Merge pull request #173 from martinburchell/save_cancel_buttons

Save cancel buttons