Adds 'Key' to progress map emitted by ManagedUpload on httpUploadProgress event
Adds 'Key' to progress map emitted by ManagedUpload on httpUploadProgress event

Resolves pr #679 and issue #785

jeskew/aws-sdk-js,guymguym/aws-sdk-js,jeskew/aws-sdk-js,grimurjonsson/aws-sdk-js,mapbox/aws-sdk-js,GlideMe/aws-sdk-js,mapbox/aws-sdk-js,guymguym/aws-sdk-js,guymguym/aws-sdk-js,guymguym/aws-sdk-js,aws/aws-sdk-js,jeskew/aws-sdk-js,LiuJoyceC/aws-sdk-js,chrisradek/aws-sdk-js,GlideMe/aws-sdk-js,mapbox/aws-sdk-js,jeskew/aws-sdk-js,grimurjonsson/aws-sdk-js,LiuJoyceC/aws-sdk-js,aws/aws-sdk-js,GlideMe/aws-sdk-js,aws/aws-sdk-js,GlideMe/aws-sdk-js,chrisradek/aws-sdk-js,chrisradek/aws-sdk-js,chrisradek/aws-sdk-js,aws/aws-sdk-js,grimurjonsson/aws-sdk-js,LiuJoyceC/aws-sdk-js