fix decimal rescale values causing Decimal data frame
adding comment about float casting
TST: Added test for decimal rescale issue.
Merge pull request #2 from moloney/bf-decimal-rescale-test

TST: Added test for decimal rescale issue.
Merge pull request #145 from bpinsard/bug/decimalrescale

fix decimal rescale values causing Decimal data frame

Error when some versions of pydicom have Decimal instead of float returned from dicom floating point string.