first import
added frozendict
minor change
name change, parametric exception class
examples added
added doctest and unittest
added delegate decorator and config example
added lazy_attribute module
added support for lazy attributes using *methods
exit code set in case on test errors
doc strings
extended doc strings
updated config
lazy attributes shared between classes supported
_doctest and _unittest moved to main
package layout
tests dir
added test_env
removed useless bins
doc strings updated