More relevant main class name

This release makes the importing more relevant:

from pymsfilereader import MSFileReader
rawfile = MSFileReader("myfile.raw")

instead of

from pymsfilereader import ThermoRawfile
rawfile = ThermoRawfile("myfile.raw")

First version on Pypi

Code and unit tests have been cleaned and best practices applied for a first release on Pypi.