Fix navigation for filtered nodes

Closed #131
Update jquery.fancytree.js

Fixed documentation of loadKeyPath()
Merge pull request #134 from TheWild/patch-1

Update jquery.fancytree.js
Merge branch 'master' of https://github.com/mar10/fancytree
cleanups and docs
tabfix & build
Added new `opts` argument to setExpanded()

Closed #128
Closed #129