installation: Flask-SSO version upgrade

Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
installation: bootstrap 3.2.0

* Upgrades bootstrap to 3.2.0.

* Upgrades typeahead.js to 0.10.2.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
assets: filters behavior fix

* Fixes the filters behaviour when no variables are set in the config.

Signed-off-by: Yoan Blanc <yoan.blanc@cern.ch>
Reported-by: Georgios Kokosioulis <georgios.kokosioulis@cern.ch>