added sqls for all models

During seafile server setup, it's better to import sqls than running
django "syncdb" command direclty.
[email-notice] use new time format
[upload-link] can not get upload link when repo access permmision is read-only
Merge pull request #246 from haiwen/lins-sqls

added sqls for all models
Merge branch 'email-notice-time'
Merge branch 'upload-link'
[user role] hide 'role' in 'add user' form, hide 'role toggle', fixed bug in 'user search'
[file view] don't request for unread notices's num
[repo] improvement for 'file upload'
[repo] fixed file/dir 'select' bug
[sign-up] check password strength at both client and server side
[passwd strength] improved passwd tip & strength display, removed 'show passwd', fixed bugs
[passwd strength] add STRONG password check(default not enabled) when user sign-up or change-password