Convert ImagesService tests to integration tests
Add test for ImagesService.getServingUrl() with secure flag
Push test annotations down to concrete test classes
ImagesService.getServingUrl() should throw exception when blob doesn't exist
ImagesService.getServingUrl(ServingUrlOptions) throws exception
Rename method parameters to make them readable
Fix image resizing
ImageServletTest and some minor fixes
Workaround OSX compiler bug.