Add Enumerate
  This will list all of the raster values within a polygon intersection.
Change Array to Vector
  This seems like a better choice, but will do some performance testing once we get it working.
Add to OpMethods
Changed to ListBuffer
Merge branch 'master' into new_enum
Merge branch 'master' into enumerate
Change type to Int
Change return type to Array[Int]
Merge branch 'master' into enumerate
Merge branch 'enumerate' into new_enum
Merge branch 'master' into new_enum
Merge branches 'enumerate' and 'new_enum' of github.com:ejc123/geotrellis

Conflicts:
	src/main/scala/geotrellis/raster/op/zonal/summary/ZonalSummaryOpMethods.scala
Merge branch 'master' of github.com:ejc123/geotrellis

Conflicts:
	src/main/scala/geotrellis/raster/op/zonal/summary/ZonalSummaryOpMethods.scala