Fixed bug: with sql generation in available_tags method of wiki
Fixed bug: showing tag div is not correct in the bottom page of wiki when there is no attachments in the wiki page
fix ixti/redmine_tags#56
Merge pull request #91 from NEXSTEP/master

fix ixti/redmine_tags#56
Merge pull request #90 from minkbear/origin-clone

Improve tag support for wiki pages
Wiki pages do not have open status, it used to crash when display a wiki page