Tests, better handling of POCOs, a couple attributes

[thegoldenmule]

Hi there,

I needed a few random things, so I added them-- don't know if you're interested.

• There was no way to just serialize a C# object, so I added that capability as a JsonObject constructor, i.e.:

var value = new MyObject();
var json = new JsonObject(value).ToString();

• There were no tests, so I added some basic ones that test all supported primitives (not double or long as they are not strictly supported in JS I don't believe), composite classes, and arrays.

• Added JsonIgnoreAttribute which makes JsonObject ignore a specific field:

[JsonIgnore]
public int Foo;

The field "Foo" will be ignored in JsonObject.

• Added JsonNameAttribute which allows changing the name of a field in json:

public class Foo
{
    [JsonName("fizz")]
    public int Bar;
}

Outputs to roughly { "fizz" : 3 } for example.

[MarcosLopezC]

@thegoldenmule

Thank you for this contribution. However, there are some changes that I want to make to the API before I merge it back into master.

[thegoldenmule]

Great, look forward to seeing them.