fixes #3178 - add feature for compute profiles for hostgroups and hosts

fixes #3930 - refactoring of edit_self implementation.

fixes #3790 - Added support for isolated engine to foreman menu

Fixes #3838: Adds ability to define a divider when declaring a menu item
from a plugin.

fixes #3820 - adds exception output to menu item authorization check

fixes #3762: menu urls defined using hashes should prefix controller name with a '/' (use absolute controller names)

refs #3510 - ensure rescue statement works

fixes #3510 - plugin interface for registering a plugin, updated menu system