renamed HStoreReferenceDictionary in HStoreReferenceDict for consistency
split fields.py contents in descriptors.py and dict.py
tidy up lookups.py
introduced __all__ to avoid importing unnecessary modules when doing "from .lookups import *"
incremented VERSION to 1.3.0 alpha
pickle support in HStoreDict
aliased pickle in picklelib to avoid clash with pickle attribute
DRY fields.py
DRY descriptors.py
schemadatabag testing env
pickle improvements + tests
virtual field
schemadatabag admin tests
admin compatibility + more tests
metaprogramming create_hstore_virtual_field
automatically generate the virtual fields
schema mode docs
schema mode cleanup + more tests
schema mode: utf8 tests
schema mode avoid mixing unicode and ascii
schema: syntax improvement

hstore.SchemaModel for consistency