Update accessrights
Add "forum" link in cabinet
Update navigation
Update accessrights
Add images and download script.

Add ./download.sh script to download icons and format 'em.
First arg is downloadUrl, second one is filename.

Add new icons:
- <add> and <edit>/<delete>
- <arrow_up> and <arrow_down>
Update access rights and initRbac command.

Make initRbac more intelligent and smart.
Now it can accurately update all authItem fields.

Build main power hierarchy:
- adminnistrator
--\- major-moderator
-----\- forum-moderator
Add default role: <user>
Add roles field in <users-grid> in users/admin/users
Replace EDIT and DELETE icons
Add AUTHOR role
Include SortableModel extension.
Increase default font-size to 13px
Update accessrights.
Add CPager
Add Forums module with database structure.

Add <init_forums> migration.
Add <forums> module with 5 models and 4 controllers.
Merge branch 'forums'