Added variable declaration to spinnerHeight
Added Discount JavaScript actions

Added edd_discount_applied which is triggered when a discount is
applied on the checkout page
Added edd_discount_removed which is triggered when a discount is
removed on the checkout page
Changed the way of spinnerHeight is created
Style .edd_discount_remove button also when not in the #edd_checkout_cart
Merge pull request #1 from barrykooij/discount-css

Style .edd_discount_remove button also when not in the #edd_checkout_cart
Merge pull request #1420 from barrykooij/master

Multiple discount related changes and additions