fix collection().update() method. bump v0.3.9

fix uploading through file input. bump v0.3.4.

update dist files.

merge with branch method-override. bump v0.3.0

don't call to getAllResponseHeaders on IE<10

IE cache buster

fix sending images and strings with FormData

don't append filename to FormData payload when value is string

update uxhr to prevent setting timeout on sync requests