Fix bug with default permission of "role" directive.

The default permission used to not be set correctly.
Merge pull request #41 from 4teamwork/jone-role-directive-permission

Fix bug with default permission of "role" directive.
Sharing role overlay: fix wrong javascript selector for ftw.permissionmanager view.

The problem was that all <th> tags were sliced (first removed), but this included both tables.
This change makes slicing per table and separate setups so that the name column of the second
table is not linked.

Also refactored overlay setup into separate function.
Merge pull request #42 from 4teamwork/jone-overlay-link-permissionmanager

Sharing role overlay: fix wrong javascript selector for ftw.permissionmanager
Merge pull request #39 from 4teamwork/jone-sharing-details-role-inheritance

Sharing describe roles: resolve role inheritance
Fix typo specification test filename.
Add role description support to specification AST.
Add language parsing support for role descriptions.
Generate translations for role descriptions.
Display the role description in the sharing overlay.
Update readme.
Update overlay screenshot.