Add optional regexp validation to service dialogs

Text boxes now expose a drop-down for validator type and
a text field for validator rule. When 'Regular Expression'
is selected for the validator type, user input will be
matched against the provided validator rule. This is similar
to how Foreman validates user input for Smart Variables.

https://bugzilla.redhat.com/show_bug.cgi?id=1085158
Added missing power state images

https://bugzilla.redhat.com/show_bug.cgi?id=1113462
Merge pull request #135 from epwinchell/missing_powerstate_images

Added missing power state images
Adding support for /api/request_tasks collection

Updating the api.yml to add the request_tasks collection
that leverages the AR MiqRequestTask Model.
Merge pull request #141 from abellotti/rest_api_support_request_tasks

Adding support for /api/request_tasks collection
Merge pull request #14 from dillaman/bz1085158-service-dialog-regex-validation

Add optional regexp validation to service dialogs
Resolve an insecure .to_sym call.
Merge pull request #144 from martinpovolny/get_view_to_sym

Resolve an insecure .to_sym call.