Fix flake8 linting issues

geomagio/Util.py

 import urllib2
 
+
 class ObjectView(object):
     """
     Wrap a dictionary so its properties can be accessed as an object.

geomagio/imfv283/IMFV283Factory.py

@@ -4,7 +4,6 @@ import obspy.core
 import numpy
 from .. import ChannelConverter
 from ..TimeseriesFactory import TimeseriesFactory
-from ..TimeseriesFactoryException import TimeseriesFactoryException
 from ..Util import read_url
 from IMFV283Parser import IMFV283Parser
 from ..ObservatoryMetadata import ObservatoryMetadata

geomagio/imfv283/IMFV283Parser.py

@@ -6,7 +6,6 @@ import obspy
 from obspy.core import UTCDateTime
 
 import imfv283_codes
-from ..ObservatoryMetadata import ObservatoryMetadata
 
 # values that represent missing data points in IAGA2002
 DEAD_VALUE = 65535