URL Encoding Issue For Files with Spaces

[jkkjonah]

As of today, the smush.it api endpoint expects all spaces in file name to be URL encoded pluses (%2B).

e.g.:
Image Name = image with spaces.png

This returns null:
http://www.smushit.com/ysmush.it/ws.php?img=http://s3.amazonaws.com/BUCKET/image%20with%20spaces.png

This returns the expected response:
http://www.smushit.com/ysmush.it/ws.php?img=http://s3.amazonaws.com/BUCKET/image%2Bwith%2Bspaces.png

1. The Autosmush library does not URL encode the image file path at all before calling CURL
2. The special case of replacing spaces with plusses needs to be added before URL encoding