#2518 - Initial moving of boxes. Customer sidebar, billing details to the bottom
Fixed bug 2733

* Ref. https://github.com/easydigitaldownloads/Easy-Digital-Downloads/issues/2733.
Merge remote-tracking branch 'upstream/master'
Rewritten check on "zero price" cart items

* Check now conforms to EDD standards.
First pass at introducing customer drop down with chosen. #2518
Fix merge conflict. #2518
Add (not fully functional) customer drop down in place of name / email / user ID fields. #2518
Add support for ajax search in the customer dropdown. #2518
New version of the add-on updater that doesn't check for updates on every page load
Wrap last checked in multisite check
Tweaked updater
Fix syntax error
Set the slug when viewing the changelog and don't show the update notification row in non-multisite
Fix issue wth update not showing in non-multisite
Use pre_set_site_transient_update_plugins
Version bump and changelog
Add some missing capability checks
Merge pull request #2734 from daigo75/master

Fixed bug #2733
Rework edd_get_cart_item_price()
remove the did_check