prepping for release, updated ewww.io address

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer/trunk@1041677 b8457f37-d9ea-0310-8a92-e5e31aec5664
tagged and released 2.1.1

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer/trunk@1041679 b8457f37-d9ea-0310-8a92-e5e31aec5664