- background gradient image missing
- made icon grey in order to keep it visible
- raised icon margin to position it directly inside the
  widget when in personalize mode
- added a background image to display the gradient

2 columns instead of 3 for issue detail

new design on ticket view
filter / options / attachments fieldset redesign

- fix project navigation arrows

Merge branch 'ticket/unstable/263-new-layout-ready' into unstable

Image URLs are not properly escaped in the bundled RedCloth3 library.
It thus allowed an XSS vector.

The patch was adapted from r7570 from Redmine by Etiene Massip. See also
http://www.redmine.org/issues/9245.

Contributed by Toshi MARUYAMA

Also let the user know that the identifier must start with a lower case letter.

Contributed by Jan Schulz-Hofen.

[#652] fixes wrong redirect after login 

Conflicts:
	config/locales/nl.yml