#7 Support for ImmutableBiMap
#7 Support for BiMap and HashBiMap

EnumBiMap and EnumHashBiMap are only supported on serialization for now
Fix serialization problem for Iterable<Iterable<...>> or Map<Key, Map<Key, ...>>
#7 Support for EnumBiMap and EnumHashBiMap deserialization

Had to change the way we pass the enum class to deserializer. We now have a getter on EnumJsonDeserializer.java and EnumKeyDeserializer.java that gives the enum class and the deserializers who need it just have to declare an EnumJsonDeserializer.java instead of JsonDeserializer.
#7 Support for Multiset