Fix bug in crop picture view.
Page#sitemap scope now depends on the current site.

This is necessary because elsewise the sitemap would render all pages from all sites which is not desired.
Merge pull request #416 from robinboening/2.7-stable

Page#sitemap scope now depends on the current site.
Bump version to 2.7.1
Fix element generator for situations where only available_contents are present. Refs #407
Re-attach folding events on restored elements. Closes #411
Merge branch '2.7-stable' of git://github.com/magiclabs/alchemy_cms into 2.7-stable