Contact Forms: Prefix all fields with a number.

Prefixing all fields by a running number let's us keep the current simple
storing format while supporting having multiple fields of the same name and
type. These prefixes are removed in the admin view, as well as the success
message (though only if the prefix exists to not break previous feedback in
admin).
Contact Forms: Strip label prefix in emails.

Strip the running number prefix from extra fields in emails, but do so only if
such a prefix exists for backwards compatibility.
Contact Forms: Fix tests.

Contact Forms tests now test for the new prefixed format of storings field
names and values
Contact Forms: Fix token subject replacement.

Token replacement from subject now takes into account prefixes in label names.
Trivial: Braces ftw.
Nuke custom Jetpack styles for Omnisearch.

They broke with 3.0 anyways, let’s just let it look like stock WP
unless we have time to do something super shiny later.

Hat tip: @philiparthurmoore, fixes #768
Contact Forms: Add Empty Spam button to feedback.

Adds an Empty Spam button to the spam view when viewing feedback, so that users
are able to delete all spam permanently in one click (similarly to comments).
Merge pull request #632 from rase-/add/empty-spam-button

Contact Forms: Add Empty Spam button to feedback.
Contact Form Omnisearch: Make sure we've got the global $post

Make sure we’ve got the $post global set up properly.
Contact Forms: Case sensitive prefix stripping.

No need to use a case-insensitive regex for stripping prefixes out of field labels when displaying them.
Merge pull request #652 from rase-/fix/identically-named-fields

Contact Forms: Prefix all fields with a number.
REST API: Return the plugin data directly.
In order to have more control over the values returned.
REST API: modify where the Jetpack only endpoints are included.
Match WPCOM structure.
REST API: Add "get update data" endpoint.
* Return count data on updates for: plugins, themes, wordpress, translations.
Contact Forms: Delete option to spam bulk actions

A bulk action option was added to the spam view to permanently delete multiple
posts at once.