Load personas data; remove personas database

and all related complexity

Squashed commit of the following:

commit 7bcd67475ec99cd5544467b9a99b1e87fcff93dc
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 15:00:14 2014 +0200

    Using firefox lets test pass (ansync problem?)

commit 9200fdce58350408b561b7883326e168e654807e
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 13:24:59 2014 +0200

    This should work now

commit c9dadcfe86bb67431069dee4356f7d6215096c49
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 13:21:33 2014 +0200

    Try again

commit 7bcc1cf45278cd9a54dc2f894bcae11783cc97d2
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 13:16:59 2014 +0200

    ...

commit 9104d8a019a57462373107f4aa42d99cc87652ff
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 12:51:01 2014 +0200

    More domina cleanup

commit 11006aa932bc1fb5be20050c7622d165a5aa4cb0
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 12:42:23 2014 +0200

    Some domina cleanup

commit c8048b403c3e789ce87ab483a3ce73ada6ff33d1
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 12:34:50 2014 +0200

    Cleanup domina files

commit 63600ba79ee731d98991e9f67f48e967169d727b
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 12:19:12 2014 +0200

    Remove lib/personas_db_helper

commit fea38f9572fb985eb363158af08e8405e4618078
Author: Thomas Schank <DrTom@schank.ch>
Date:   Wed Apr 9 11:14:00 2014 +0200

    Try to use DBHelper.load-data with cucumber
Add madek:db rake tasks to load and dump data only, and to truncate
Ansible setup: reset data to personas (for now)
Nodejs is not a rbenv dependency (and it's not available on wheezy)
dev: start a script collecting the needed step to setup or reset a local dev environment (not finished yet, but works)
ui: /my: list contexts similar to /explore, but only user's context (if any)

Squashed commit of the following:

commit f576421525ba3ccafbc6711cc282d614f4b3e065
Author: Max F. Albrecht <1@178.is>
Date:   Fri Apr 11 16:12:13 2014 +0200

    ui: /my: make /my/context more consistent (and translated)

    part of [#44584457]

commit dc9f8beb0de8d4ab7a4bff52e82052a5137572e3
Author: Max F. Albrecht <1@178.is>
Date:   Tue Apr 8 12:26:33 2014 +0200

    ui: /my: duplicate everything related to meta_contexts from /explore

    part of [#44584457]