when there is a System.DBNull in the result set, return a null to javascript, (System.DBNull was returning an empty object{}

Conflicts:

	lib/edge-sql.dll
Merge branch 'i_like_nulls_yay' of https://github.com/ryan-allen/edge-sql into ryan-allen-i_like_nulls_yay

Conflicts:
	src/edge-sql/EdgeCompiler.cs
Merge branch 'ryan-allen-i_like_nulls_yay'