v0.1.0

SpatialGraphs v0.1.0

Merged pull requests:

• Finalize 1st draft of types and structs, add docs (#1) (@vlandau)
• Graph constructors and tests (#2) (@vlandau)
• Add methods for SimpleGraphs and associate tests (#3) (@vlandau)
• LightGraphs interface fixes, add more tests (#4) (@vlandau)
• LightGraphs => Graphs, GeoData => Rasters, some changes to type names (#5) (@vlandau)
• fix graphs interface for weighted graphs (#6) (@vlandau)
• Revert "fix graphs interface for weighted graphs" (#7) (@vlandau)