Add up to 20 stocks! Also, loads stock data using async function, which allows for better page load time.

git-svn-id: https://plugins.svn.wordpress.org/show-stock-quotes/trunk@860083 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagging version 1.1

git-svn-id: https://plugins.svn.wordpress.org/show-stock-quotes/trunk@860084 b8457f37-d9ea-0310-8a92-e5e31aec5664