located where I should check for URL pattern
Detect and ask the user for completing insecure operation

Implemented detection and asking the user if we should go ahead with
‘external’ URL loading.
Completed fix for bug 144
Removed comment from code
Fix brace on same line as condition and button text
Merge pull request #718 from twosigma/ildipo/bug-144

Fix for 144: When loading a plugin from a cross-origin URL, show a dialog warning the user that it could be unsafe