fixes #832 - adds parameterized class support

Credits:
This patch is based on the original work of Olivier Favre
<olivier@yakaz.com> many many thanks!

• import class parameters, and try to understand their types
• support a complex matrix of environments, puppet classes and their...

fixes #1825 - unable to select an openstack image.

Note that probably Fog 1.5 is required for this to work.

The new form should save 'New compute resource'

fixes #1849 - Add the current hostgroup name when editing

minor SQL improvments

Reformatted the 'all puppetclasses' page linked to from hosts

minor view improvments to vmware

- adds a console link to all vms
- adds a minimal vm details view

Subnets API

a bunch of fixes to get functional tests running under 1.9.2

added environment API