* Zombies:
- Fixed some issues with IE.
- Added the use of hidden iframe to spy user navigation. This
feature does not work yet with IE, so it can be enabled/disabled
using the ZOMBIE_USE_HIDDEN_IFRAME constant.

* File browser:
- Added display options (to filter hidden files, directories,
symlinks or files)
- Colors enhancement.
- Sort enhancement (same sort, whatever browse method is used).