Revert "UI/UX: context 1/3" since tests fail

This reverts commit f9cebb3c07f89a8e5f5880124b7e7493adc419bb.
dev/reset: make more readable
admin: meta context with meta key definitions section and groups section

Squashed commit of the following:

commit ed25df156659ab8c6aa15851afd01467e9129c58
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Mon May 26 10:09:09 2014 +0200

    meta context with meta key definitions section

commit cb07a0a5573440fdef6d52b348ecb929fd3d9466
Author: Michał Podlecki <m.podlecki@op.pl>
Date:   Mon May 26 07:34:42 2014 +0200

    admin meta context groups section
dev: add a Markdown-Table of GET routes; plus small script to generate it
doc/routes: merge changes from next
routes: rename 'media_entries' to 'entries', 'media_sets' to 'sets' and 'media_resources' to 'resources'
fix renaming with 'to' and 'as'; take back 'media_resources
fix renaming with 'to' and 'as'; take back 'media_resources #2