Feature adds & refactors to reprojection.

 - Added a mechanism to have a manual conversion between CRS's, so you can substitute a more performant method. Created a benchmark to prove that this was the case for LatLng <-> WebMercator.
 - Optimize .reproject by passing around transforms instead of creating a new one for every point.
Added approximate transform, filling out reprojection logic.

Conflicts:
	proj4/src/main/scala/geotrellis/proj4/Transform.scala
Reprojection with nearest neighbor, bilinear interpolation
Merge remote-tracking branch 'upstream/master' into reproject
Merge remote-tracking branch 'upstream/master' into reproject
Writing unit tests for reprojection, not passing yet.
Unit test around RowTransform, nearest neighbor and approx transform work & work fast
Cleaved Interpolation.scala
Merge remote-tracking branch 'upstream/master' into reproject
Split out interpolation.
Removed BilinearInterpolation.scala
Ignore bilinear test until it's implemented.
Merge pull request #834 from lossyrob/reproject

Reprojection
Modified ingest to prep for Accumulo ingest
Merge pull request #853 from lossyrob/ingest-process

Modified ingest to prep for Accumulo ingest
Modified the colormap to read as an vector of byte triplets. Also
removed option value on Photometric Interpetation and added test for the
colormap reading.
Merge branch 'master' of git://github.com/geotrellis/geotrellis into feature/geotiff-reader-colormap-array
Merge pull request #854 from johanstenberg92/feature/geotiff-reader-colormap-array

Added extended parsing of the colormap data.