More than half-baked (v0.3.1)

• Handle radarserver metadata #27 #46 #37
• Simplify following CatalogRef urls #35
• Warn and try xml link in TDSCatalog if passed HTML link #32
• Add info for conda development environment #41
• Be less pedantic in validating catalogs #28

0.3.0

• Comprehensive catalog parser
• Client for NetCDF Subset Server (NCSS)
• Parsing of NCSS metadata
• Client for TDS radar server
• Simplified catalog API