Update to installer

Install database image was not migrated to version 4. Also added a link
to install in the missing config page.
Added upload folders
Added comment about thumbnail naming
General fixes to task statuses

Task status was not saved upon creation and was breaking stats all the
time.
Fixed status creation view
Custom colors for status labels
File browser now uses current shows
User profile functionality

Now we can:
* change profile info
* change password
* show assigned tasks
Added a 'Select Task' to the Edit Shot interface

This forces a user to select a task type to be assigned to the shot.
Basic notification system

Users are allowed to subscribe to a shot and get notified when a user
posts a comment on it. A wider infrastructure is in place (but not
working yet) to notify about other shot changes.
Fix for admin comment notifications

To prevent model migration issues.
Making installer subdomain compliant

The installer now support the latest database migration and allows the
installation of Attract in a subdirectory. Doing so is not advised at
the moment as the application templates do not support this yet.
Added support for subdirectory.
Fixed comments link in edits shots page
Fixed edit link on view shots page
Merge pull request #42 from nonami/master

Added support for subdirectory.
Merge pull request #5 from fsiddi/master

update from original