Added URL support for out SR

Output spatial reference system URL parameter now supported. Projection
code is not yet implemented, though. :warning:
Replaced NTS with DotSpatial

Replaced NuGet package references. DotSpatial now used instead of
NetTopologySuite.
:warning:  Serialization to GeoJSON is not currently working correctly.
Web project now compiles, projects

The web service can now return projected output.
Added conversion files to repository.