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
Make slideshows keyboard accessible
Add -ms-filter to css
Chain jQuery functions and reduce time to 200
Merge pull request #923 from jeherve/change-videoppress-module-text

VideoPress: add configure link to the module description
Switch to hasClass() for focus check
Merge pull request #825 from jonatansteller/master

Add Co-Authors Plus plugin compatibility to the mobile theme
Merge pull request #1119 from chrisdc/a11y-slideshow

Make slideshows keyboard accessible
Running a grunt pass.

Removing trailing whitespace from jp.js, and recompiling css.
Replace subscribe form inline JavaScript with HTML5 placeholder and allow admin to set placeholder text

Use input type="email" instead of "text"

Input should be empty if !user_email

Add IE9 <label> fallback w/JavaScript

Fix fallback label formatting and add text fallback

Changes per @georgestephanis

Remove superfluous esc_html() parameter from subscriptions.php line 636
Merge pull request #932 from CFXd/improve-subscribe-widget

Replace subscribe form inline JavaScript with HTML5 placeholder and allow admin to set placeholder text