oq-ui-api/geonode/exposure/util.py:

Corrected time of day handling in exposure queries.
oq-ui-api/geonode/exposure/views.py:

Updated exposure schema to the latest version and corrected handling
of ToD in exposure export.
oq-ui-api/geonode/exposure/tests.py:

All tests pass.
Merge pull request #41 from gem/fix-exposure-tod-export

Fix exposure export ToD handling and update NRML schema

[r=matley] [f=1192998,1187008]