html_safe: activatePanelRow(). Fixes loading 'versions' tab on wiki page
added csrf meta tags to crabgrass_javascripts, so prototype_ujs works as expected (fixes wiki version 'destroy' and 'revert' links)
some html_safe for wiki versions, diffs etc.
use ajax request for "revert" and "destroy" links in wiki versions, so the layout doesn't get busted.
Merge pull request #20 from Crabgrass/bugfix/4145-destroying-wiki-versions

Bugfix/4145 destroying wiki versions