Update src/main/scala/geotrellis/raster/TiledRasterData.scala

Doc typo fix.
Add datamap benchmark of spire's cfor w/ integer values.
Merge pull request #349 from joshmarcus/topic/spire_benchmark

Add datamap benchmark of spire's cfor w/ integer values.
Update src/main/scala/geotrellis/feature/op/geometry/GetEnvelope.scala

Fixed a doc string.
Adding jacoco plugin for code coverage
Merge pull request #386 from lossyrob/coverage/jacoco

Adding jacoco plugin for code coverage