Transform, ngwmn-geoserver WFS to SOS feature.
Much cleaner SOSService.
Map SOS to URL
SOS GetFeatureOfInterest works, except:
* id filter does not work, due to geoserver configuration problems
* bounding box is untested
IMPLEMENTING - issue GWDP-701: Implement a WaterML2.0 SOS for Water
Levels 
https://internal.cida.usgs.gov/jira/browse/GWDP-701

GetFeatureOfInterest functional.
Merge remote-tracking branch 'upstream/master'
IMPLEMENTING - issue GWDP-701: Implement a WaterML2.0 SOS for Water
Levels 
https://internal.cida.usgs.gov/jira/browse/GWDP-701

Added comments and TODOs.
Corrected errors from code review.
First cut at getObservation
Merge pull request #10 from rhayes-cida/master

Add SOS service