Jetpack: Holiday Snow: Remove the snowflake from the adminbar.

In hindsight, looks like it was more confusing than helpful.

Revert "Jetpack: Holiday Snow: Add an adminbar item of a snowflake if the user can control the snow being active, they are in wp-admin, and it is currently "

This reverts commit 30fca55f265f7fe0e08ea9265f150be0aac0ef11.
Adding in blank files for backcompat with anything manually including them.

Fixes some errors that have cropped up like:

```
Warning:
require_once(/home/private/public_html/wp-content/plugins/jetpack/module
s/featured-content/featured-content.php) [function.require-once]:
failed to open stream: No such file or directory in
/home/private/public_html/wp-content/plugins/jetpack/modules/theme-tools
.php on line 54
```

Introduced in
https://github.com/Automattic/Jetpack/commit/7a3e6bf205e08c2ffa4a2b4514f
6513a875c4d51
Add compat file support for twentyfourteen

Add into theme-tools.php the ability to load a theme-compat file, and
make it extensible so that themes or plugins can add or remove them.
Use class_exists() guard for Featured_Content.
Allow other templates to supply og tags
Only truncate description if one is provided
Merge pull request #1 from tierra/feature-content-guard

Use class_exists() guard for Featured_Content.

Necessary for wp-cli compatability, as wp-cli loads plugins -after- themes, as opposed to before like core does.

Implementing this in theme-tools.php rather than theme-tools/featured-content.php so as to maintain the file integrity of featured-content.php against its wpcom variant.

Props @tierra
Merge pull request #4 from Automattic/2.7.1

Merge the changes in 2.7.1 upstream to master.
Twitter Timeline: fix Undefined index notice
tweet-limit was undefined in defaults

Read more about the issue here:
http://wordpress.org/support/topic/undefined-index-tweet-limit
Add a readme.md to display neatly on GitHub

Our readme.txt is aimed to match the WordPress.org plugins standard,
and is a bit cluttered for generating the GitHub readme.  This is a
tidied up version!  Fixes #5, thanks to @maxme for the reminder.
readme.md: correcting listing @jeherve twice
Twitter Timeline: add a message to explain 0 tweet-limit

See #6 for more details.
Add jetpack_no_publicize_post filter

Allows plugins to prevent particular posts from being sent to publicize. Ref #7
Tidy up new filter for disabling publicize on a post.

Follow-up to 4b741e2e702a2fb8ba14afa66a0f121e78ef3391

Whitespace fixes, renaming the filter to something that makes it a bit
more understandable, and pass the post’s data across with it.

Also converting to Core’s new recommended brace syntax.
Revert "Tidy up new filter for disabling publicize on a post."

This reverts commit 8ed18b1eef0c2b9dfdbaab0d8efdfec05ce20b1c.
Revert "Add jetpack_no_publicize_post filter"

This reverts commit 4b741e2e702a2fb8ba14afa66a0f121e78ef3391.
Jetpack: Update theme compat includes function to only require compat
files necessary for the current theme.
Jetpack: Add Twenty Fourteen compatibility file for Featured Content and
Post Flair.
Jetpack: Set 'featured' as the default tag name in the customizer for
Twenty Fourteen.
Jetpack: SSO: Consolidating wording to 'two step'

Consolidating 'two factor' and 'two step' to be 'two step' to align with wording on https://wordpress.com/settings/security/