SirenMatchers doesn't check ISirenEntity.Properties

[ryantmer]

See here.

Wasn't able to determine a good way to define matching/equality with the properties as dynamic in #11. One possible solution would be to introduce a breaking change so that ISirenEntity.Properties is an ISirenProperties object, e.g.

interface ISirenProperties {
    Equals(ISirenProperties other);
    Matches(ISirenProperties other);
}

Upon implementation, you would define your class MySirenProperties : ISirenProperties, implement the interface, and add your arbitrary properties. This leaves it up to the implementer to decide what "equality" and "matching" is w.r.t. their properties.