Instantiate EdgeFactory with a scaleFactor

Prior to this, a scale factor of 1000 was applied to all data written
(via raw input client) prior to writing to edge server. This is still
the default, but now user can change this scale factor. This will
allow the EdgeFactory to be used to read data it did not write, and
rescale it if necessary. Note: default is 1000, not 1, for backward
compatibility.