Enhancement: Option for Arbitrary Attributes

[mahemoff]

Request to support an option for additional attribs on the link tags. (Just one option for all tags generated against a particular string.)

Working at https://github.com/mahemoff/javascript-linkify

[cowboy]

Linkify has been WAY at the bottom of my ever-growing list, but I will get to it. Someday. Keep on forking, and I'll merge things back in when I have the time to go over them. Thanks!