add dresden to onruby, closes #63

commit d210c7ac40e2ba31c1b0634854f4c2cd2e730412
Merge: b884679 214ed90
Author: Peter Schröder <phoetmail@googlemail.com>
Date:   Fri Jan 11 10:55:01 2013 +0100

    Merge branch 'rubydresden' of git://github.com/zealot128/on_ruby into zealot128-rubydresden

commit 214ed90b1a90169433a08b2e8cba22e7e6e93e8f
Author: Stefan Wienert <stefan.wienert@pludoni.de>
Date:   Thu Jan 10 19:48:59 2013 +0100

    final logo :)

commit 2f91b382a0daec6e4713e758b13141ceb6f9d48f
Author: Stefan Wienert <stefan.wienert@pludoni.de>
Date:   Thu Jan 10 19:33:15 2013 +0100

    Dresden.de new logo

commit a86ad9fa2e391f4f49d26b388214340e9ff99a8a
Author: Stefan Wienert <stefan.wienert@pludoni.de>
Date:   Thu Nov 8 20:43:52 2012 +0100

    dresden logo

commit 85548cd015067f8620860447f81755d5720e567b
Author: Stefan Wienert <stefan.wienert@pludoni.de>
Date:   Thu Nov 8 13:33:09 2012 +0100

    Merge conflict again

commit 7ccd0a86901df8f4f5e59dc3e42ba337cc78c420
Author: Martin Schrader <martin.schrader@gmail.com>
Date:   Wed Oct 31 20:08:35 2012 +0100

    merge conflict with leipzig
fix some styling with nested headers
split auth logic to distinguish between twitter and github, closes #62
add icons for browser bar and ios bookmarks, closes #60
fix icon for pages without label
allow nil in github and twitter and finish the migration
Styling of Homepage:

* aligned the images and titles by defining a maxwidth for the image container
* hide the close button on the "Choose your community" alert text - which makes no sense at this point
* reduce (empty) header height, so content comes earlier
Merge pull request #64 from zealot128/styles/homepage

Styling of Homepage
Chosen added to user-selector in admin events form

Also added a coffee file for admin
Merge pull request #65 from zealot128/admin/user-select

Chosen added to user-selector in admin events form
allow nil AND blank values, closes #66