[#81100542] [#81097244] granting read only access to the inventory and contracts for a group_manager

Squashed commit of the following:

commit f214208d23823d45d1573afc185bb12ff1039d0e
Author: Franco Sellitto <franco.sellitto@zhdk.ch>
Date:   Tue Oct 28 11:35:05 2014 +0100

    icons and hiding tabs

commit 353d1f18d28676d52e25d0c8cfb89b3dddc832c5
Author: Franco Sellitto <franco.sellitto@zhdk.ch>
Date:   Mon Oct 27 16:25:24 2014 +0100

    [FIX CI]

commit a64371b6c5d9db3a949807deb01a411055a67685
Author: Franco Sellitto <franco.sellitto@zhdk.ch>
Date:   Mon Oct 27 16:13:16 2014 +0100

    display open and closed contracts to a group_manager

commit 238e60de176279478e509f49a53c4dc166a9181e
Author: Franco Sellitto <franco.sellitto@zhdk.ch>
Date:   Mon Oct 27 14:11:36 2014 +0100

    [FIX CI]

commit 24141da2500643e41463b29e82cc6ae257b880b8
Author: Franco Sellitto <franco.sellitto@zhdk.ch>
Date:   Mon Oct 27 13:37:58 2014 +0100

    [FIX CI] group_manager and category search

commit f4702444e3dfa81a3992acbb0e944feb4ea29404
Author: Franco Sellitto <franco.sellitto@zhdk.ch>
Date:   Fri Oct 24 15:51:48 2014 +0200

    granting read only access to the inventory for a group_manager