Implement IMeta for PersistentArrayMap and PersistentTreeMap
Merge pull request #28 from patrickgombert/map-meta

Implement IMeta for PersistentArrayMap and PersistentTreeMap
adds PersistentHashMap
creates abstract macros for maps and seqs; refators platform array and object ns
Merge pull request #29 from mylesmegyesi/persistent-hash-map

adds PersistentHashMap
Begin to implement Ratio