Beginning implementation of ui date-filtering
Merge branch 'master' into WATERSMART-269
Improving stats param ui.
Adding interdependent date field validation.
Killing kruft.
Removed stat start and end date hardcoding in favor of user-selected dates.
Testing out parser, RdbTable functionality.
Reformatting, cosmetic re-hierarchicalization of tests.
Reformat FOR REAL.
Implemented nwis web period of record for min and max range of stat parameters.
Enabled user to select stat group. Switched stat params from CommonState to Stored State so that users can eventually share their stat param runs.
Merge pull request #34 from cschroed-usgs/WATERSMART-269

Watersmart 269