Add treestyletabs.js

[dkearns]

Assuming it's still required you might want to add the :style command that is needed for Tree Style Tab to work properly in Pentadactyl. Something like the following:

style -name tabbrowser-height-fix chrome://* <<EOM [dactyl-australis=true] .tabbrowser-tabs { max-height: unset !important; }
EOM

[ntnn]

I didn't have any problems with it so far, so I guess the fix isn't needed anymore.