Merge pull request #20 from Ecotrust/master

Additional changes for forest planner integration
Update .gitignore
initial upload testdata

Slope, DEM, mills, teststand
edited requires
deleted routing (unncessary)
changed data to new testdata + changed import gis`
updated
Update README.md
skidding returns tuple for coord_landing_stand instead of geometry

close #25
initial upload

work on #21
deleted
initial upload

work on #21
Revert "initial upload"

This reverts commit 673445ea8f8fd94d1d48e75e56dbd667243369ba.
initial upload

work in #21
changed comments
added harvesting system components

needs further description
clean up and restructure #23

close #23
added test cases #21
Update README.md
Update README.md