initial commit
initial port of functionality: grib identification, resolution, remote presence checking, downloading
added README.md
fixed error in determining the latest useable cycle given the simulation start time
added primitive instruction following grib2 retrieval strategy
added grib_source_info() to grib_source_server.erl
added start_grib_server/3 and stop_grib_server/1 to dynamically add/remove grib servers at runtime
minor README update
merged with initialized github repo