增加一个高斯投影的小工具

Signed-off-by: yhexie <yhlx125@163.com>
Merge branch 'master' of https://github.com/yhexie/RGEOS

Conflicts:
	ProjNet/SharpMap.CoordinateSystems/CoordinateSystems/Projections/GaussKrugerProjection.cs
	ProjNet/SharpMap.CoordinateSystems/CoordinateSystems/SREnvironment/SpatialReferenceEnvironmentClass.cs
修改小工具Gauss

Signed-off-by: yhexie <yhlx125@163.com>