Draft: Iris Factory

fixes #37

Usage on command line (iris_network defaults to NT):

geomag-py --input iris --iris-network IU --locationcode 40 --observatory ANMO --inchannels U --interval second ...

geomag-py --input iris --iris-network IU --locationcode 40 --observatory ANMO --inchannels H --interval second ...

geomag-py --input iris --iris-network IU --locationcode 40 --observatory ANMO --inchannels LF1 --interval second ...

geomag-py --input iris --observatory NEW --inchannels U --convert-voltbin U --interval tenhertz --type variation ...

geomag-py --input iris --observatory NEW --inchannels BEU BYU --interval tenhertz --type variation ...

Usage for web service:

http://.../ws/data/id=ANMO&elements=U,V,W&type=variation

http://.../ws/data/id=ANMO&elements=U,V,W&type=40 -> type parameter limited to variation and 40

http://.../ws/data/id=ANMO,elements=H,E,Z&type=variation

http://.../ws/observatories/ -> Included in listing for all supported web service observatories

http://.../ws/observatories/ANMO

usage is the same for the geomagnetism team's observatories

Current implementation allows a user to write edge channels using the factory, but this is an advanced option. Thus, the controller does to include this factory as an option for its output factory