Add IgnoringSourceProperties()/IgnoringTargetProperties()

[floyd-may]

There needs to be a way to easily ignore multiple properties; this kind of thing is noisy:

var mapper = FluentMapper
    .ThatMaps<Thing>().From<OtherThing>()
    .IgnoringSourceProperty(x => x.Id)
    .IgnoringSourceProperty(x => x.Prop)
    .IgnoringSourceProperty(x => x.YetAnotherProp)
    .IgnoringSourceProperty(x => x.Properronius)
    .IgnoringSourceProperty(x => x.MoarDataz)
    .IgnoringSourceProperty(x => x.GetThePictureYet)
    .Create();

Should be able to use an anonymous type like so:

var mapper = FluentMapper
    .ThatMaps<Thing>().From<OtherThing>()
    .IgnoringSourceProperties(x => new {
        x.Id,
        x.Prop,
        x.YetAnotherProp,
        x.Properronius,
        x.MoarDataz,
        x.GetThePictureYet,
    })
    .Create();