Add display rules method
Add - rule add link
Improve code for displaying rules
Move bracket to a new line
Remove overqualified links
Add navigation

Replace U_BACK
Replace language var
Fixes for categories and add rule
Some fixes for rules navigation
Replace is_category code
Replace current_level code
Remove nestedset
Add get rule path data
Remove nestedset from admin service
Remove enter
Fix docblock
Remove boardrules_table from controller
Remove @user
Remove newline
Merge remote-tracking branch 'upstream/master' into admin-method-3