0.2.0

• Introduced support for reading write rasterband pixels (#56)
  band.pixels.read(x, y, width, height, [buffer], [options])
band.pixels.write(x, y, width, height, data, [options])
  
  For more information and other available methods, see the RasterBand Pixel API documentation.
• Added support for generating dataset overviews (#63)
  dataset.buildOverviews(resampling, overviews, [bands])
• Added support for more vector formats: gpx aeronavfaa bna dxf csv edigeo geoconcept georss gml gmt gpsbabel gtm htf idrisi dgn openair openfilegdb pcidsk pds pgdump rec s57 sdts segukooa segy sua svg sxf ntf tiger xplane wasp (#60)
• Added envelope.toPolygon() method.
• Stability improvements.