Switch stable to 2.7.2

git-svn-id: https://plugins.svn.wordpress.org/ecwid-shopping-cart/trunk@1041098 b8457f37-d9ea-0310-8a92-e5e31aec5664
Changelog style corrections

git-svn-id: https://plugins.svn.wordpress.org/ecwid-shopping-cart/trunk@1041102 b8457f37-d9ea-0310-8a92-e5e31aec5664