Add searchable full text to media entries and media sets
Admin interface: fix deleting meta terms

Squashed commit of the following:

commit 3716116eb9cf5e5de68eecdcc3209714ec4e2156
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Fri Jul 18 09:49:23 2014 +0200
Fix permission preset option positions

Squashed commit of the following:

commit 12b2ec2d7fb31a5dc2ed456aee1d68314a6c1410
Author: Jonasz Grochowski <tensaioni@gmail.com>
Date:   Tue Jul 15 14:03:29 2014 +0200
Admin interface: display and search by meta key's label in relation to a context

Squashed commit of the following:

commit 93f12374ed9db78c7ae5e0ba91e299c49940e45c
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Fri Jul 18 11:39:28 2014 +0200
Admin interface: keyword list improvements
  - pagination
  - display the user name, who created a keyword term