Updates and fixes to the Upcoming Events widget
Better handle how repeating events are displayed.  Props @jacklenox
Shortcode: Flickr: Embed updates props @batmoo

* add support for new Flickr web embeds for photos via the shortcode
* Override core's Flickr support because Flickr oEmbed endpoint doesn't support web embeds
* Support for legacy Flickr slideshow embeds that end with /show/ (There are not handled by the new embeds and must be passed through to their remote oEmbed handler)
Shortcode: Google Maps: Fixed regex that identifies google maps iframe embeds

Apparently the new embed code for google maps only looks like <iframe STUFF_HERE></iframe> and doesn't include a <small> tag at the end. I made the <small> tag optional though it could probably be totally removed since nothing uses it when it's matched.
Props @omarjackman, @dllh
Vimeo shortcode: update the regex parsing to work with the new vimeo embed code
Props @jkudish
YouTube Shortcode: Add support for the two closed caption arguments.
props @viper007bond
Featured Content: Remove default value.
This should not cause any headaches with existing installs, since it never worked outside of Twenty Fourteen.
props @obenland
Likes: Avoid a PHP Notice when $_POST['post_type'] is not set in the meta_box_save function.
props @jblz
Jetpack Likes: Make sure save like meta box options for attachments too, and switch to using a list of public post types vs. just post|page so that it's forward compatible should we add other post types to wpcom in the future.
Props @dllh
Contact Form: Revert a bad commit, try it again.
The fix for overly broad CSS is to specify it, not delete it, thereby undoing the reason for its addition in the first place.
See: https://github.com/Automattic/jetpack/pull/68
Minileven: Prevent the nav menu from overlapping the admin bar when logged in.
Props @michiecat
Widgets: Gravatar Profile: Two minor changes pulled from upstream
0. Don't forget to echo what you've esc_html'd
1. Remove the inline style as it was causing problems for Theam.  Hi, @sixhours!
Merge pull request #116 from Automattic/merge-20140122

Merge in changes from upstream.