add Local operations issue #478
add new local operations to LocalOpMethods
Merge branch 'localops' of git://github.com/Markko/geotrellis into localops

Conflicts:
	src/main/scala/geotrellis/raster/op/local/LocalOpMethods.scala
Add unit test for localAbs.
Didn't need extra comparison.
Add unit test for local Acos.
Fix test so that int raster contains only ints.
Add unit tests for Asin.
Add local atan unit tests.
"Fix" loca arctan2 implementation.

Changed it to work on two op rasters.
Actually it's not done yet. It needs a dualCombine
in order to change possible NODATAs into NaNs.
Don't forget to convert the type.
Add test for local cos.
Add unit test for local atan2.

Re: commit 142208bc722002a9450957620952c132a2972a5f
I was wrong it's already taken care of for me. Phew.
Fix cos tests.

Added coverage for range of 0 - 2pi.
Add tests for local sin.
Add tan tests.
Add tests for local sinh, cosh, tanh, log10.
Merge branch 'master' of https://github.com/geotrellis/geotrellis into
localops

Conflicts:
	src/main/scala/geotrellis/raster/op/local/LocalOpMethods.scala
Merge pull request #732 from sconealone/localops

implement Localops with unit tests