Release v1.3.0

Changelog:

• Created a new procedure graph.versioner.patch.from which adds a new State to the given Entity, starting from the given one;
• created a new procedure graph.versioner.get.nth.state which gets the nth State node for the given Entity;
• created a new procedure graph.versioner.rollback.nth which rollbacks the given Entity to the nth State;
• now every time a State node is passed through a procedure, a check will ensure that it's related with the given entity,

More information can be found here.