foundation for solid angle correction
working on solid angle
solid angle wrapper functional
merged master branch
added some comments to solid angle implementation and cleaned up header file so it is understandable from the header to figure out what the functions do (as it should)
Travis failed, tried to revert pre-processor definitions to see if it works
fixed an erronous character in header file
Merge pull request #85 from tjlane/solidangle

Solidangle