* images' requests for optimization are sent for all sizes upon image upload in media gallery
* non-image (e.g. PDF files) are ignored now @ bulk processing
* bulk optimization improved & some bugs fixed.
* FAQ/Description small changes



git-svn-id: https://plugins.svn.wordpress.org/shortpixel-image-optimiser/trunk@1044773 b8457f37-d9ea-0310-8a92-e5e31aec5664