HTML5: Support mozSlice/webkitSlice where possible. Workaround Gecko FormData+Blob bug (#649150). Fix Safari.
HTML5: Support mozSlice/webkitSlice where possible. Workaround Gecko FormData+Blob bug (#649150). Fix Safari.

vitr/fend005-plupload,moxiecode/plupload,envato/plupload,moxiecode/plupload,vitr/fend005-plupload,envato/plupload