Added ComplexWithUncertainties class
Merge branch 'obspy.station' into complex_uncertainty
Cleaned up ComplexWithUncertainties
Added ComplexWithUncertainties to util init
Add test for ComplexWithUnceratinties
Added FloatWithUncertainties to __init__
Fixed lots of typos in test_util_types
fix one issue with ComplexUncertainties

(see https://github.com/obspy/obspy/pull/691#issuecomment-30053423)
station: use ComplexWithUncertainties for Poles/Zeros, also I/O for
stationxml