deep serialize any extra data params passed in when submitting multipart
fix issue where certain extraData form fields get sent with spaces encoded as +s
Fix for #201 and #217
Fix for #217
#218; wrong context scope
#216; typo in comment
#214; upload cancel improvements.
#213; Ability to specify multiple fields with the same name on iframe submissions
#214; improve fix for stopping upload aborts
merge
#200; support deep serialization for extra data args
#234 provide access to jqxhr
#233, xhr upload method
#105; add support for deferreds.
update docs for jqxhr
Update documentation to use standard form selectors, e.g. input[type=radio] instead of :radio.
Replace deprecated :submit with standard [type=submit] selector.
Replace deprecated :image with standard [type=image] selector.
Update :file to now be standard [type=file] selector.
Remove depreated :input selector and just use attribute selectors since we are already searching within form context.