Fixed my merge gone bad
Readme for cross sells merge fix
Fixed posting shipping method when only one is available

As committed on master branch:
- https://github.com/woothemes/woocommerce/commit/d8ba734d4f71a050df82947d2a8184f7dd8e515d
Fixed query breaking when using some product widgets and closes #3333
Add actions for attribute create/update/delete

As committed on master branch via:
- https://github.com/woothemes/woocommerce/pull/3298
2.0.12 version bump
Stripslashes
Correct sanitization of option fields.

@coenjacobs if we do do another maintainence release, this one would be
beneficial
Update add-to-cart-variation.js
Merge pull request #3389 from neilpie/master

Simples
Extra escaping on layered nav href to prevent injection
Merge remote-tracking branch 'origin/release-2-0-12'

Conflicts:
	assets/js/frontend/checkout.min.js
	classes/widgets/class-wc-widget-best-sellers.php
	classes/widgets/class-wc-widget-onsale.php
	classes/widgets/class-wc-widget-random-products.php
	classes/widgets/class-wc-widget-recent-products.php
	classes/widgets/class-wc-widget-recently-viewed.php
	readme.txt
	woocommerce.php