Optimized speed of DB/hash, DB/equiv and Datom/hash
version bump
Entity's touch call accessible through datascript namespace
Attributes with `:db.cardinality/many` should accept all collection values (#16)

Before this commit, they only accepted sequential values.
Now they accept everything that implements IPersistentCollection.
Do not treat maps as coll values for :db.cardinality/many attributes (closes #16)