use file reader for the config template file upload.

fixes #1165 add inherited params display and override option to the host form.

Signed-off-by: Ohad Levy <ohadlevy@gmail.com>

fixes #1726 ie support for edit template (with a simple text-box).

make sure that info messages are not shown when filtering is enabled refs #1634

fixes #1712 When Ec2 provisioning, resolve button shouldn't show pxe nor provisioning template.

added commit comment, history and preview to the template editor.

fixes #1649 Puppet class and environment import works only on the first smart-proxy

fixes #1697 - hostgroup class listing showed all classes regardless of environment

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

minor fixes to host show page