uc_hosting 6.x-1.0-beta4

This release comes with a bunch of little improvements and useability fixes to Aegir:
* Improved workflow and control for skipping the site creation form during purchase #1134490: Improve the workflow for skipping the site creation form
* An admin section that displays products with uc_hosting_products features enabled
* A bunch of code optimization to remove some duplicate code and simplify development of additional features
* Allow the platform access and site features to peacefully coexist on the same product #1135456: Change the "one feature per product" rule to "one feature of any given type"