Enabling Safe Iframe for Input class #1221

Updating Input class so the HTML.SafeIframe and HTML.SafeIframeRegexp
functions use the safe_iframe_regexp option when clean up inputs.
Updating typo on clean file and upating config.template

These changes should allow embed items to be shown on the report detail
page.
Merge pull request #1244 from ditorelo/1221

Enabling Safe Iframe for Input class #1221