Adding support for a default time position
Merge pull request #94 from asascience-open/master

SOS and SensorML Cleanup
fix a typo in the previous commit
Add a test for WMS Time layers
Merge pull request #92 from vicb/wmst_default

Adding support for a default time position
Return raw SOS response if no Exception tag is found.  #97.
Follow the SOS spec and use case sensitive observedProperty as a key.

fixes #97
Add helper to SensorML capabilities element. Cleanup.
Make the python-dateutil requirement >=