Added Add all to cart feature for paid version and fixed a bug in both versions regarding the cart icon.

git-svn-id: https://plugins.svn.wordpress.org/music-seller/trunk@971690 b8457f37-d9ea-0310-8a92-e5e31aec5664
Added Add all to cart feature for paid version and fixed a bug in both versions regarding the cart icon.

git-svn-id: https://plugins.svn.wordpress.org/music-seller/trunk@971692 b8457f37-d9ea-0310-8a92-e5e31aec5664