load 50 topics in sitemap instead of all
limit topicsperpage postsPerPage to 20
introducing "sort" querystring parameter in topic route, so that sorting can be overridden via query string.
made uid parameter optional in getPidIndex
getPidIndex callback if none specified
upping mentions minver for 0.5.1
closes #2039
dont create term object on each call
Merge remote-tracking branch 'origin/0.5.1' into cluster