v0.15

• Streams created from data-types (Map, Set, Queue ... ) use the bag from within the data-type.
• added eventually.persistent.SetMap
• added added eventually.persistent.Queue
• added build.info file which stores the version and used to perform compatibility checks.
• MultiMap is not experimental anymore.

Breaking change - with the addition of build.info file, previous versions are incompatible with this version.