Remove almost all docstring in the blog/__init__.py.
Simplify the docstring in the blog/application.py.
Simplify the docstring of handlers module by PEP257.
Remove the such as part of the docstring of context module.
Modified the comment situation.
Extend docstring of the model module.
Format the docstring of the model module.
Format the docstring of utils module.
Add docstring of the config.py and split every option with a empty line.