Add support for MultiPoint geometries.  Changes apply to all functionality except GP.
Added support for GP services with multipoint input and output parameters.  Also corrected casing of JSON geometry type parsing
Merge branch 'v.next' of https://github.com/esri/arcgis-viewer-silverlight into zwaap/Issue9_MultiPointSupport
Merge pull request #54 from Esri/zwaap/Issue9_SupportMultipoint

Add multipoint support