Changed renderPng with no params to assume it's a RBGA raster.
Update Build.scala
Merge pull request #703 from lossyrob/RenderOpMethods/render-color-raster

Changed renderPng with no params to assume it's a RBGA raster.
Renamed Image to Raster in the geotrellis-spark codebase
update deprecated API calls in JacksonWrapper
Add a test for PyramidMetadata
Merge remote-tracking branch 'upstream/master' into localingest