[kdtree] Switch from tabs to spaces
[kdtree] Made choosing the media more efficent
[kdtree] Reduce memory consumption while importing
[kdtree] Speed up node tree creation significantly
[geodata] Implement RTree-Variant.
[importer] Don't import empty objects
[tests] Fixed geodata tests
Merge pull request #9 from alacarte-maps/efficient-kd-tree

Made the kd-Tree implementation more efficent