audit as twitter and versions for template.

This also closes #1377 as it offer versions and diff view of the tempates.

it is not ideal, but it should handle the most common case for now,
where we should open other feature requests to support all of the ideas in #1377

wip audits upgrade

don't allow to delete a provisioning template when its assigned to an OS default template

make DNS lookup not fail on socket errors

Since ssh script now runs post commit, we can not update any attributes within the save method

fixes #1676 have memory size use factors of 1024

fixes #1667 - restrcutre fog extensions code

fixes #1656 add support for systems with terabytes of memory

[EC2] Adds retry on host not available, add some useful debugging.

- debugging, to get the whole message
- add backtrace to compute resource failure msg
- add debug logging for Fog errors on create

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....