Merge pull request #14 from kmussel/master

add load_entity method (used to check if entity is deleted)
Remove unnecessary begin/end from Transaction.run
Merge pull request #15 from kmussel/master

fixed up how properties are added to vertices
Merge pull request #16 from kmussel/master

removed nil values from properties
Merge pull request #17 from kmussel/master

used the property converters before new vertex creation
Add hoooks stuff
stuff