Updating plugin homepage url

git-svn-id: https://plugins.svn.wordpress.org/jellyfish-invaders/trunk@1005554 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating demo url in readme

git-svn-id: https://plugins.svn.wordpress.org/jellyfish-invaders/trunk@1005556 b8457f37-d9ea-0310-8a92-e5e31aec5664