Searchlink 1.6 update

Thanks to a catch and fix from Nathan Henrie, the SearchLink service has been updated to 1.6. It was snagging on matches where a [link](http://url) preceded a Searchlink [text](!s) type of link and combining the url with the search command. This is remedied now, and thanks to Nathan for the fix!

Download the update below, and see the source and Nathan’s comments in the gist.