Use the HtmlHelper::tableHeaders helper to display the table headers
Added a function to delete events.

Currently this only allows single events to be deleted.
Added a link to each event row to delete that event.

This fixes #126 however that issue was not specific enough.  This
commit allows a user to delete individual events.  There is currently
no way to delete multiple events.
Removed an unneeded div in the Events view.
Merge branch 'modern' of github.com:ZoneMinder/ZoneMinder into modern