Show tool tip when looking up word via Google returns no results

Previously this would result in an error being inserted into the document.
RFC references in text, strings and comments are now recognized

The space between the RFC keyword and the number is optional when the keyword is preceded by a space, e.g. ‘See RFC822’ will be matched but ‘/path/to/rfc822’ will not.

For the records, links can be opened via enter (⌅) which is fn-return on “laptop keyboards”.
Do not base64-obsfucate email addresses in links
Use selected text for URL (instead of clipboard content)
Do not fetch title from URL for HTTP links.
Define URL as tab stop (for HTML and Markdown)
Make “Wrap Selection as Link” available in all scopes.

Because it is also useful in comments, strings, ...
Use HTML link template as default for all scopes (unless overridden by more specific scope like Markdown, ...)
Use Mac OS system ruby (1.8).

Script does not work with Ruby 1.9, and '/usr/bin/env ruby' may be Ruby 1.9.