Migrate keywords, resurect models and specs for keywords

Squashed commit of the following:

commit aad5753f3eba7b1c652ef9263315766f072d90a1
Author: Thomas Schank <DrTom@schank.ch>
Date:   Tue Nov 25 10:58:05 2014 +0100

    Link resources to keywordsto keywordsto keywordsto keywords

commit 7140439c84ef9dc9edd42b1156e27b2bedb870fe
Author: Thomas Schank <DrTom@schank.ch>
Date:   Tue Nov 25 10:52:42 2014 +0100

    Resurect keyword models and specs

commit 540e52ffa3c20c1ff2247663c20aaec68486bd9a
Author: Thomas Schank <DrTom@schank.ch>
Date:   Fri Nov 21 13:32:42 2014 +0100

    Delete keyword data

commit cd65f383f18af1de3baf74b2d0e1b8c222e94be8
Author: Thomas Schank <DrTom@schank.ch>
Date:   Fri Nov 21 13:21:57 2014 +0100

    Migrated schema and data keywords
add doc/Manual.md (Projekthandbuch alpha)
doc: Manual: clarify permissions, fix typo
Update /doc/Manual

Squashed commit of the following:

commit 5d6eab2318e40de3e382c64da72c7f159eabfff5
Author: Thomas Schank <DrTom@schank.ch>
Date:   Tue Nov 25 16:19:53 2014 +0100

    ...

commit 851493288c8d6a7708d753dbedcac11a1c0ac9bf
Author: Thomas Schank <DrTom@schank.ch>
Date:   Tue Nov 25 16:15:48 2014 +0100

    ...

commit 60c36bca57c877cf973492389c1286dc34763997
Author: Thomas Schank <DrTom@schank.ch>
Date:   Tue Nov 25 16:14:48 2014 +0100

    More docu

commit 436f788086fbd11f49b29ab0109e3d016c00f7cd
Author: Thomas Schank <DrTom@schank.ch>
Date:   Tue Nov 25 16:06:42 2014 +0100

    Update   doc/Manual.md
ReRefactor media_entry_userpermissions according to new names
Update Schema diagram wrt favorites
Create and migrate media_entry_grouppermissions, add models and specs

Create media_entry_grouppermissions

Fix migration, create factory and model

close this up
Rename to ApiClient, add factry and basic specs
Create and migrate media_entry_api_client_permissions, models, specs, factories

Migration for media_entry_api_client_permissions

Finish this
Consistent renaming to media_entry_user_permission
Consistent renaming part2
migration
migration file finished
new personas 100 sql with more favorites
personas & structure sql after migration