adding georeferencing satellite images guide @hrwgc
added band=1 option info for making colorizer work properly @hrwgc
clean up style
edit language about colorizer
Merge pull request #2026 from mapbox/raster-docs

Raster docs
Merge branch 'satellite-docs' of github.com:mapbox/tilemill into satellite-docs
copy modifications to make these guides not blog posts
pansharpening process not solid enough for guide