API now allows for search of usergroups

refs #2141 - ensures no duplicate trends are created

include nested host routes in the api documentation

fixes #2141 - Trends grahs issue

fixes #2154 - "Foreman" link in main navigation should link to dashboard

fixes #2161 - Cannot delete a host if the compute resource VM is already deleted

fixes #2124 - only include classes from the host current environment.

This patch introduce a new setting, which decide how would foreman
address a mismatch between host and hostgruop environments.

for example, when puppet classes (directly or indirectly via hostgroups) that do not...

fixes #1827: use ids instead of names for templates routes

fixes #2159 - Provisioning information shown in locations/organizations while provisioning is disabled.

fixes #2160 - do not store Finished catalog run messages