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
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
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
VideoPress: add configure link to the module description
Refining the setting of site_tag when twitter:creator is present.

This is an attempt to close #935. I added a class method that
will take in the current value for site_tag and og_tags and
return a new value for site_tag if twitter:creator is set in
og_tags. If nothing is set, it returns the original value of
site_tag.
Merge branch 'master' into use-twitter-creator-for-twitter-site
Move theme support check to `add_setting` argument
Add Customizer section priority

Sets the Customizer section priority below the core sections. Fixes #538
Site Logo: Add the WordPress.com Site Logo feature to Jetpack.

Site Logo allows a user to upload a logo that will persist and be displayed in all themes that support the feature.

WordPress.com support page: http://en.support.wordpress.com/site-logo/

Standalone plugin: https://github.com/Automattic/site-logo
When calling /sites/%s/posts/ include all attachments not just the first 5.
Site Logo: Prefix theme functions.
Site Logos: Update the docblock for jetpack_the_site_logo().