Put upload to S3 via dropzone.js

        uploadMethod: 'PUT',

        uploadAdded: function(file, item) {
          //Recieve the signed PUT request here
          //I can create another GIST if anyone would like the code for signing the requests
          mydropzone.options.url = url;
        },

        uploadSending: function(file, formData, xhr) {
            xhr.setRequestHeader('Content-Type', file.type || 'application/octet-stream');
            xhr.setRequestHeader('x-amz-acl', 'private');
        }
/*
  Cors config for your bucket:
      <CORSRule>
        <AllowedOrigin>*</AllowedOrigin>
        <AllowedMethod>PUT</AllowedMethod>
        <AllowedHeader>*</AllowedHeader>
    </CORSRule>
    The * can be changed out, I just didnt feel like recording all the additional headers
    If allowed origin is managed properly having a wild card for headers should not be an issue
*/