Add METAR/BUOY elements

This pull request includes:
- an adapter that allows for complex attribute separators (defined by a regex)
- a processor that filters out GeoEvents that it has already seen
- a GEP configuration that uses these to process METAR and BUOY/CMAN data from NOAA
- a README that explains how to set everything up for Weather data

All at 10.2.2 at the moment...