- project/file system browser now supports multiple level directory navigation:
 * quite a few updates to the projectBrowser view to accomodate for this (experimental)
 * tested (manually) with browser, dropbox and node stores : working but need to prevent navigation attempts on files (files don't have sub elements, doh !)
 * simplified and cleaned up store api a bit : listProjects /projectFiles replaced with listDir
 * save/load temporarly disabled