Updates various dependencies including mini_magick to fix a security flaw.

2013-03-12 - Remote code execution
If a URL is from an untrusted source, commands can be injected into it for remote code execution with the ; character.

Affected versions:
All
Identifier:
CVE-2013-2616
Sources:
http://vapid.dhs.org/advisories/minimagick.html
http://direct.osvdb.org/show/osvdb/91231
Fixes access to the articles editor, broken by a previous commit.

Switching to a resourceful model broke various things, including articles deletion. Fixing article deletion route broke new article one. This commit breaks deletion again but at least fixes new articles.

TODO: actually fix article deletion! It's 4:22 AM so I'll do it when I sleep. Also write some tests as the get / post / delete actions seems not tested, leading to the above mentioned bugs.