tagedit-insert-equal also inserts "" for attrs
Change private prefix to te/ for brevity
Add experimental mirroring when inserting tags
Bugfix for tagedit-kill

 - you can now even kill tags when looking at them. Wonderful!
Explicitly require 'sgml-mode

This prevents byte compilation errors / warnings.
Merge pull request #3 from purcell/patch-2

Explicitly require 'sgml-mode