Added a network paramter to all list of Observatories and Variometers. I made this a non optional paramter within Observatory.py.

Adding a few changes to FDSNFActory regarding the FDSNNoDataException. I also created a private function to contain the logic that removes sensitivity/response info for traces. I added all avaiable stations that transmit geomgagnetic data for networks, IU, N4, and US to the VariometerMetadata.py module.

Committing two new files, FDSNSNCL and FDSNFactory. The factory is modeled after the MiniseedFactory with the additional functions that retrive azimuth and dip. The Factory also relies on the get_waveforms method of obspy instead of get_timeseries. The instrument response is also attached and then that response is altered using the remove_response method in Obspy. This returns the response in nT, but we may have to change this depending on whether there are variometers with a frequency response. The __init__.py file was also edited to incooporate the FDSNSNCL and FDSNFactory.

Revised the minute definition in ObservatoryMetadata and VariometerMetadata. Removed the ObservatoryMetadata variable from IRISFactory and replaced it with the VariometerMetadata variable and an optional variable that points to the VariometerMetadata module.

Updated the IRISFactory to support the new VariometerMetadata class. Also removed unnecessary lines of code in VariometerMetadata.py and ObservatoryMetadata.py.

Added the script VariometerMetaData.py to the geomagio folder. Also updated Obsevartory.py to use the VariometerMetaData dictionary to populate a list of observatories using the Obersvatory class.