added summary to ConcurrentHashSet;
ConcurrentHashSet: added a little documentation
fixed svn-ignore; what will happen on github???
Aardvark.Base: added IntermediateOutputPath property moving obj folder to bin directory;
some cleaning up in Aardvark.Base/Telemetry
fixed Polygon ComputePerimeter
update README.md
added Geo.ComputeLengthWgs84 and Geo.ComputePerimeterWgs84
cleaned up distance computation in Geo
commented out unused variable (error under Mono)
update README.md
minor cleanup
merged development branch into master