Started development of version 0.2.3, deprecations from 0.2.2 removed
Transition from dictionaries to list-of-tuples for `gets()` and `pops()` completed
Refactoring; moving methods related to loading files to `Reader()` class
Reader() class finished, polishing `__include__` mechanism to work with it
Finished refactoring to Reader(), problems with `includes` solved. New
unit tests and manual updated.
Methods moved to `Reader()` removed from `Properties()`