Add closure support for `accessControl`

This fixes the issue where the `accessControl` wouldn't accept a closure.
config
Merge branch '2.x' of github.com:Studio-42/elFinder into 2.x
Merge pull request #426 from boekkooi/patch-1

Add closure support for `accessControl`
Merge branch '2.x' of github.com:Studio-42/elFinder into 2.x
add jquery 1.9.1 ui 1.10.1
fix call_user_func call
update ui theme
fix ui theme
fixes #522
add Vietnamese translation
fixes #513
Merge branch '2.x' into 2.1