Rename MetaDepartment to InstitutionalGroup

Conflicts:
	db/personas.20140721075032.data.psql
	db/personas.20140808090502.data.psql
	db/structure.sql
	features/admin_groups.feature
Feature test: admin_groups, fix whitespace and remove needless @firefox
Fix inheritance of individual contexts

Squashed commit of the following:

commit a81955b08938a925779f9f7c6d693c08eace5620
Author: Jonasz Grochowski <tensaioni@gmail.com>
Date:   Thu Jul 31 14:08:17 2014 +0200

    Add fixes to controller and model + tests
Admin interface: improve workflow of managing meta key definitions

Squashed commit of the following:

commit b3c28c3563dbd7766987d29dff49bdb85ca11ebb
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Tue Aug 26 09:48:45 2014 +0200

    Admin interface: improve workflow of managing meta key definitions
Add displaying of random images for filter sets

Squashed commit of the following:

commit dde6b6b99fec60e9add1e1c8d8f727630c586347
Author: Jonasz Grochowski <tensaioni@gmail.com>
Date:   Mon Aug 18 08:44:44 2014 +0200

    Add displaying of random images for filter sets
Be explicit, there is no such thing as ordered_by(:random)
Admin interface: use autocomplete to change responsible person of a set

Squashed commit of the following:

commit b1f4219d3ecd8ddab7493d6c407dd4b9f777adb0
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Tue Aug 26 10:46:22 2014 +0200

    Admin interface: use autocomplete to change responsible person of a set
Upgrade rails and gems