Added AMD, some QUnit tests and minor fix for GeoJSON to EsriJSON.

I updated the source to accommodate AMD loading when available and Global loading when not. The module name ('extras/jsonConverters') is just something I came up with on the fly. I added Unit tests for the GeoJson to EsriJson conversions, as that is what I was focusing on. I also made a minor fix to the conversion of GeoJSON MultiPolygons to EsriJSON Polygons.