Add NSDataDetector support

[rnystrom]

h/t @SD10 for the idea! Inspired by TTTAttributedLabel.

[SD10]

Another popular, lightweight alternative to UITextView in Swift is ActiveLabel. They support other detectors for hashtags, mentions, and regular expressions. I think a regex detector option would suffice. The pattern for hashtags/mentions can be too client specific -- they can just add their own regex

[rnystrom]

Bummer that is just a UILabel subclass 😞