Modified POJOs by turning them into JPA entities.  Added dependencies to pom and persistence unit to META-INF
Created DAOs to access the entities from the database.
Created TodoService to handle restful calls that involve Todo objects.  Only have GET for a single Todo object currently implemented.  Added DateTimeSerializer so jackson knows how to serialize joda DateTime objects.  Removed list of todo objects from user in order to remove infinite recursion issue.
Updated author tag for all classes to be 'Mitch Dunn'