Add Support for Locks

• Can now pass :lock as an option on governs call

Multiple States on Single Schema

• This release now enables multiple state machine fields on a single schema
• You can have multiple events table or single events table and multiple machines

0.2.0: - added list of valid states

- list of possible events

0.1.3

• Added ability to add comment

0.1.2

- make Eventful the main module