minor cleanup for iframe response.
fix apidoc link.
fix to guess apiUrl.
adjust some options for gm.
more interactive curl example.
cleanup convertFile() logic. not yet completed.
extract and mass cleanup jquery slider plugin.
mass cleanup jquery cropper plugin.
separate from jquery slider plugin.
mass cleanup using my own jquery slider/cropper plugin.
minor fixes.
remove downloadVariant() API: it many cause inconsistent state of cache(variant files could be deleted at any time)