Link and period formatting changes

[gdewald]

Changes:

• Don't show link href in parentheses if link is tautological (normalized href matches content).
• Don't add a space prefix before data starting with '.' (also addresses #7 )

This code is a bit hacky but I thought I'd share it anyways. Feel free to merge either change if you think it would be beneficial.

Input: <div>If you would like to provide feedback please email <a href='mailto:johndoe@example.com'>johndoe@example.com</a>.</div>

Original output: If you would like to provide feedback please email johndoe@example.com (johndoe@example.com) .

New output: If you would like to provide feedback please email johndoe@example.com.

Issues:

1. Not i18n.
2. Potential issues with periods in other contexts.

[jaytaylor]

@gdewald I like this very much, thanks for the contribution!

Best, Jay