assets: resolution of jquery to ~1.11

* Changes the jquery resolution to ~1.11 instead of <2 since it would
  pick jquery 1.7.2 as required by jquery.treeview. It solves the
  problem of jquery not being found at:
  `vendors/jquery/dist/jquery.js`

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>