fix issues with spaces in binary paths

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer/trunk@861077 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix issues with spaces in binary paths for windows...hopefully

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer/trunk@861148 b8457f37-d9ea-0310-8a92-e5e31aec5664
fixing retina image optimization

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer/trunk@862739 b8457f37-d9ea-0310-8a92-e5e31aec5664
adjusting cloud validation caching

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer/trunk@862828 b8457f37-d9ea-0310-8a92-e5e31aec5664
faster bulk scanning, and small improvement for image processing

git-svn-id: https://plugins.svn.wordpress.org/ewww-image-optimizer/trunk@864884 b8457f37-d9ea-0310-8a92-e5e31aec5664