add struct Preferences
add interface to get/update Preference
Add ShortFileName to Attachment
Add currentVersionEditor to entry and make meta_info to new ui 1.2
add struct Preferences
Merge branch 'dev' into preference
preference: add TimezoneOffset
Merge wiki url to entry
add data into user
preferences: make all attributes of Preferences type to string
Add api to update group slug.
 Add VersionAt to entry
Revert "Add api to update group slug."

This reverts commit 4c06553e5e32ad3d24cbe77fa056de00cfdace13.
Merge pull request #2 from theplant/preference

Preference
Use Ajax to get all version comments
post,task,wiki -> entry
Merge branch 'dev' into new-mails

Conflicts:
	input.go