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”.
Use version 1.8 of ruby for bundle items

10.7 and 10.8 only include ruby 1.8, so all bundle items have been written to work with that. Optionally supporting ruby 1.9 and 2.0 is problematic as these versions are not fully backwards compatible.

#ignore
merge Ruby-related updates