allow to consume provisioning templates via JSON, show method was missing

ensure that API calls get correct 404 error

fixes #1648 - User filter on hostgroup could extend to new sub hostgroup.

fixes #1619 - X-Forwarded-For multiple IPs

fixes #1650 - Session expiration prevent HTTP authentication delegation

fixes #1657 - Support Puppet http reports processor

this patch allow usage of puppet http report processor.
in order to use it simply update your puppet.conf to have the following:

reports = http
reporturl = http://foreman/reports

NOTE: its not possible to use ssl URLS with the current report processor (AFAIK)

Send error messages through JSON instead of just {"errors":[]}

fixes #1572

fixes #1597 - Restrict compute resources access by user

And add some rights to give non admin users so they can perform some normal actions on the hosts they own.

unit/domain_parameter_test.rb self-broke... added a tiny fix.
Removing compute_resources/vms nesting, it is such a nightmare for functional tests....

minor visual fixes to the compute resource view.