set version to 2.0.0.rc1
removed #default_options in favor of specific keys
use extend instead of include, there are only ClassMethods
prepare for Mongoid support
allow default field options
made anon module more succint
added #each_pair method to SE::Enum
extract hash builder to be changed
get rid of AS::HashWithIndifferentAccess
use SE::Hasher instead of method delegation
make liberal use of SE::Hasher
normalize option attributes
make SE::Enum asn SE::Accessor independent
remove obsolete options hash
extract SE.suffix option
use accessor as method name
improve naming of generate_ methods
added SE:Enum#each as alias to #each_pair
fixed a typo in the README