Top Posts: add link to post thumbnail
Top Posts: add title, class, and data-bump-view attribute
Image Widget: add a new option to open links in separate tab
Contact Form: do not display the logged in user's details

Can be overwritten with the jetpack_auto_fill_logged_in_user filter
Fixes #694l
Related Posts: Pass formatted date of post to front end.
Related Posts: Output post's date before context.
Related Posts: Style date on front end like context.
Contact Form: fix spacing

See https://github.com/Automattic/jetpack/pull/725#commitcomment-6888035
Add support for Co-Authors Plus

Adds authors generated by the Co-Authors Plus plugin (supported by WordPress.com VIP) to the heading and fixes a missing "%s" in the heading for regular author pages without the plugin
Add support for Co-Authors Plus

Adds support to the byline for authors generated by the Co-Authors Plus plugin (supported by WordPress.com VIP) and simplifies the regular author link that is displayed when you don't have the plugin installed
Add Filter By Role in Widget Visibility
Make author heading code more readable
Make byline code more readable
Get rid of that semicolon
Use a hook instead of the if structure
Use a hook instead of the if structure
Add back the rest of the byline
Put the byline back in there, again
Update Widget Visibility, add user loggedin filter
Fix translation string and use yoda condition for logged in filter