adding blist back for python-driver of cassandra
things for init sqlalchemy
access dict as obj for Config
move serializer code around
not used anymore
reimplement user POST with sql
shorten module name

- exceptions -> exc
separate Core

now runtime related moved to Runtime object, other more 'static' things
(ex. declarative_base in sqlalchemy) are in Preparation
contextmanager for sqlalchemy session
user POST now only accept 2 parameters