Fix Version Check for IE11

IE 11 does not have MSIE string in user agent, so check for IE 8 causes it to break pages showing on IE 11. Check makes sure MSIE before comparing against IE 8
Carousel: Update IE browser check

Updates the IE browser check to utilize WordPress core functions instead of
attempting to test the browser agent string, which has changed format in
IE 11. This commit closes #172 and creates a new PR for the functionality
Carousel: Final tested fix for IE 11
Altering how the jetpack-tools-to-include works to make it do something useful.

Currently this filter does a whole lot of nothing, though it was designed by @tmoorewp with good
intent. Updating the filter so that it actually does what is expected of it.

This first commit includes the initial POC that it will indeed work with the Social Links.
Moved holiday-snow.php into the jetpack-tools-to-include filter

This will still automagically run holiday-snow.php by default, but also makes it a bit easier to
turn off if the site admin feels it is frivolous :)
Add Random Redirect to jetpack-tools-to-include filter
Update new Social Links loader to correspond with the original init hook priority
Add featured content, infinite scroll, and custom post types to jetpack-tools-to-include filter
Added theme-tools.php to jetpack-tools-to-include filter
Tiled Gallery: Remove extra quote in HTML.
Adds Pinterest attribute to display share count. Fixes Automattic/jetpack#597
Landing page templating with wp.template.

Got rid of the icanhaz templating and using wp.template instead.
More whitespace in jp.js
Template instead of jQuery html injection in jp.js

Inject the contents while templating, instead of building the containers and
injecting the contents afterwards.
Activation and configuration on landing page cards

Added a link to activate or deactivate a selected feature or configure it
directly from the landing page feature cards.
Infinite Scroll: add Google Universal Analytics Support

Props @DeanMarkTaylor
Infinite Scroll: remove extra ]

See https://github.com/Automattic/jetpack/pull/789/files#r14565151
Infinite Scroll: refactor GA support

See https://github.com/Automattic/jetpack/pull/789#issuecomment-48062581
Infinite Scroll: add some spaces
Merge pull request #749 from kraftbj/pinterest-count

Sharing: Adds Pinterest attribute to display share count props @kraftbj