remove .warning class

only seems to be used by xmldb and clashed with the utility
class in Bootstrap 3 of the same name
use extend to make /report/security use BS labels

These classes are only used on one admin page so I'll file
a bug to try and at least combine them with the similar classes
that are only used on another admin page for the environment
and maybe at the same time introduce a renderer for Bootstrap
style labels.
organise the plugins css to group related stuff
save some space for plugins with no icon
this html no longer exists I believe
make plugin-control-panel status messages labels
Merge pull request #127 from ds125v/misc

Misc