Rename msvVTKPolyDataFileSeriesReader related files. (Issue #13)

Rename msvVTKPolyDataFileSeriesReaderTest1.cxx to
svVTKDataFileSeriesReaderTest1.cxx,
msvVTKPolyDataFileSeriesReader.cxx to msvVTKDataFileSeriesReader.cxx
and msvVTKPolyDataFileSeriesReader.h to msvVTKDataFileSeriesReader.h.
Rename and modify msvVTKPolyDataFileSeriesReader class. (Issue #13)

Rename msvVTKPolyDataFileSeriesReader to msvVTKDataFileSeriresReader,
it now works with more generic vtkDataReader. Also modify files using
msvVTKPolyDataFileSeriesReader previously to use this new class.
Merge pull request #24 from rchristie/13-msvVTKDataFileSeriesReader

Closes #13