Fixed a lack of curly brackets in Compare.
Add VectorClock to AbstractCRDT
Implement ORSet<T>.Merge
Add IEquatable<TwoPhaseSet<T>>
Implement IEquatable<GSet>
Simplified DefaultActorId()
Add comparison operator overloads
Complete Merge function
Actor clean up

* Change AbstractCRDT.DefaultActorId to int
* Eliminated double call to GetHashCode in AbstractCRDT.DefaultActorId
* Removed Actor from GSet