Added functions and queries to support season field, simplified harvesting a bit
Fixed function and var names
Reverting resource->s3 and doing season processing outside of Cascalog
Use dwca-reader functions to extract season
Add test for harvesting back in
Check for and handle mal-formed lat/lon/months
Merge pull request #79 from VertNet/feature/seasons

Added functions and queries to support season field, simplified harvesting a bit