SciTools/cartopy — pull request #420 by rhattersley (2014-05-15 15:19:21+00:00)
Title: Port WMTS rendering to GeoAxes.add_raster().

Notable changes:
- Rename `RasterFetcher` to `RasterSource`
- Re-instate `RasterSource.validate_projection`
- Add `projection` argument to `RasterSource.fetch_raster()`
- Allow `RasterSource.fetch_raster()` to return `(None, None)` to signify no image to be rendered.
- Refactored and simplified the internals of the WMTS image retrieval.

Fixes #419.