Fix parent wiki menu entry preselection

- the parent menu entry if it has already been selected
- the menu entry pointing to the parent wiki page if there is both - the parent page and its menu entry
Change variable naming in wiki menu items controller
Update changelog
Fix parent menu item preselection of grand children of a wiki page
Delete loc of wiki_page#nearest_menu_item
Add integration tests for parent wiki menu item preselection
Add integration test for wiki menu item preselection of deeper nested sub wiki pages
Fix indentation of wiki menu item spec
Spec wiki_page#nearest_parent_menu_item, add documentation
Make functional tests functional again, don't verify assertions on basis of rendered view
Merge pull request #501 from opf/feature/rails3_default_parent_wiki_menu_item

Feature/rails3 default parent wiki menu item