Correct ordering for email form fields

The email sent by the jetpack contact form now lists the form fields in
the order specified by the user.

Previously, the default form fields (“name”, “email”, “website” and
“comment”) always appeared first followed by any custom fields.
Shortcodes: add all supported shortcodes to module card
Shortcodes: add Upcoming Events shortcode to module card
Widgets: add new widgets to module card
Widgets: add the Upcoming Events widget to the module card
WordPress Posts Widget: Self-close one <img> tag

I overlooked this when merging b7404d8175.
Check whether Jetpack is active or in development mode before loading module extras.
WordPress Post Widget: Apply 'jetpack_widget_name' filter to title

This technique should be used rather than hardcoding in the "(Jetpack)"
part of the title.
WordPress Posts Widget: Add `alt` attribute to featured images

Suggested by @jeherve.
Merge pull request #147 from kovshenin/patch-1

Don't load module-extras.php if Jetpack is not active
Jetpack: Featured Content: Prevent Featured_Content class from loading on plugin list page

Prevents the Featured_Content class from loading on the plugin list page. This allows other
plugins to load their own Featured_Content class without requiring an explicit check to
determine if Jetpack's Featured_Content class is loaded. Also ensure that class will be
the Featured_Content class that is used and Jetpack's own Featured_Content class will
automagically disable itself.
Merge branch 'master' of github.com:Automattic/jetpack
Add in some copy to the options screen

Props @m, to provide some clarity as to what’s actually going on.
Tidy up spaces and tabs.

tabs > spaces
Jetpack: Update Log: Add mention of Publicize CPTs
Thanks @emzo for the reminder
See https://github.com/Automattic/jetpack/commit/1a49f142625bbe36e31c1cad5087d991cd2be686#commitcomment-5209724
Jetpack: Languages: Add translations for 2.8.
Jetpack: How to Release: Remember to validate pending waiting for approval strings.
Remove Limit Login Attempts if its xmlrpc for Jetpack.

If Limit Login Attempts is installed as a mu-plugin,
it can generate a suprising number of  false-positives.
PHP requires HEREDOCs to have a newline after them.

See:
http://www.php.net/manual/en/language.types.string.php#language.types.st
ring.syntax.heredoc

> The closing delimiter must also be followed by a newline.
Comment out the setting for the slideshow background.

We’ll readdress this in a subsequent release.