Merge commit 'cec41f85068c1e00d5a51d97b67d8db6b02b55d3'

Conflicts:
	Kean.Tests/Kean.Tests.csproj
	Kean/DB/ITable.cs
	Kean/DB/Item.cs
	Kean/DB/Query.cs
	Kean/DB/Sql/Table.cs
	Kean/DB/Table.cs
	Kean/Kean.csproj
Added support for serializing enumerables and added support for NoTypes flag.
Fixed bugs.
Added handling of null values in JSON.
Enhanced internal linking in serialized documents to conform with JSON pointer.
Changed _link to  and _type to  in JSON serialization.