add refactory function getDirectory in documentService and unit test for it
add refactory function getfile in documentService to init directory before get single file detail, and make unit test for it
fix the bug in wiki page service to make sure init content tree before get single wiki page
add comment for init case in documentservice and wikipageservice
merge with new ui for document
change controller and partical work with new service function in doucment service
fix the bug about after downloading file to show in detail page
minor css fix
Merge branch 'master' into stian
Refactored GroupService and group loading in controllers