Add option to define ActiveRecord scopes for each value rather than class accessors to the integer value
Add pry for development debugging
Test scopes behavior
wip
added rspec

Signed-off-by: lukas <lukas.westermann@gmail.com>
Merge branch 'master' into lwe-v2
use latest ruby version
started work on actual rspec suite
use ActiveSupport::Concern
extracted #generate_enum_getter_for
are validations still required?
extract generate setter to method
extract presence method
extract generation of dirty methods
added tests for human_enum_name
remove obsolete methods
extracted #human_enum_name into own module
extracted final attribute method out
remove simple_enum_defs
rename enum_cd -> enum