Add support for WITHIN_RADIUS queries
Update documentation
Merge pull request #11 from steventlamb/topic/point_within

Topic/point within
Add ability to filter by species model, with tests
Use separate SELECT statements for querying plots versus trees

The LEFT JOINs prevent using species.id in the WHERE clause, so a normal
JOIN needs to be used instead.
Fix filterStringToWhere tests
Update README.md
Merge pull request #7 from maurizi/topic/filterSpecies

Add ability to filter by species model, with tests