Add 'permissive_temp', make more permissive, make 'temp' more strict.

'permissive_temp' was once just for internal use, now it's available as
it's own category. Also changed around logic flow to catch more temp
windows. Specifically Vundle, but should work for windows of that type.
Update docs/readme for 'permissive_temp' type
Add compiled tags file
fix some lingering false positive issues.

Boolean logic is convoluted in PluginTemp and PluginPermissiveTemp. Made
nerdtree checks it's own step to ensure proper evaluation. Also removed
permissive temp requirement for readonly, temp does this already, and
made it even more permissive.