Various improvements to the database that relate to the Data Acquisition module:
1. Create a database user that has minimal privileges, for use by the Java application.
2. Add some real HealthMap data to the database as test data (affected tables: alert, diseaseoccurrence, location).
3. Ensure that createdDate is populated in the Hibernate objects after a save.
4. Add Location.GeoNamesFeatureCode column (and populate it in DataAcquisition)

And some changes to Data Acquisition made while getting real data from HealthMap:
5. Use HealthMap's country ID instead of country (as the latter can be null).
6. Allow start date "number of days before now” to be specified as a property.
7. Improve JSON parsing of numbers (doesn't fall over if the input number is a string)
Fix findbugs issue
Fixes in response to review
Merge branch 'master' into 71-db-improvements-data-acquisition
Expanded lat/lng to latitude/longitude
Merge pull request #27 from SEEG-Oxford/71-db-improvements-data-acquisition

ABRAID-71: Database improvements for the Data Acquisition module