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.
Add POST handling for uploading of .arg and .json data
Merge remote-tracking branch 'upstream/master' into feature/fileupload

Conflicts:
	.gitignore
"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.
Change Datastore fields -- currently has a broken test case
Don't forget to convert the type.
Fixed test issue.
Guard against the DataStore having an invalid path.
Merge pull request #1 from lossyrob/feature/fileupload

Fixed test issue.
Fix typo in test case
Merge remote-tracking branch 'upstream/master' into feature/fileupload
Add spec for scaladoc