Automatic project setup

Developers can have their dev environment set up with autogen.sh. This is also building the project for the first time.
Starting over

This commit is setting up a C# project that is creating a library for
manipualting octrees of any kind.
Creating a VS2012 project file

Though the build system is NAnt, Visual Studio can be used for
convenient manipulation of the source files. This is done with these
project files.

Also the namespace of the Octree class has changed.
Add NAnt build files

The NAnt build system can be invoked from the repo root. It calls the
build files in the subdirs with the same target, only setting some
values for them to use.
Merge pull request #3 from HaMster21/master

Starting over