Added `uploadMethod` for specifying POST/PUT (default POST)
Added customResponseParser to allow server responses to come back in different formats (and get handled nicely)
Switched position of file getting attached to formData as S3 appears to need the key to be first?!
Added `uploadMethod` for specifying POST/PUT (default POST)
Added `customResponseParser` to allow server responses to come back in different formats (and get handled nicely)
Added `addFileBeforeExtraParameters` property to allow file to be appended after extra parameters
(Amazon S3 has an issue with the `key` not being the first form data element)