Exception when running the benchmark on windows
New OrthogonalJumpPoinFinder added

This finder differes from the JumpPointFinder in that it only
allows horizontal and vertical movements.
Merge pull request #54 from imor/OrthogonalJPF

New OrthogonalJumpPoinFinder added
bump npm version to 0.4.7
Merge pull request #53 from imor/FixBenchmarkException

Exception when running the benchmark on windows
bump version to 0.4.8