* Greatly improved module documentation
* Code style improvements with the use of pylint tool
* BC breaking refactoring to unify code style
* Multiple minor bugfixes

Note: I am well aware of the ugliness of such a huge commit. However all of the changes were done in a short time and as part of a single big feature upgrade and in my opinion in this case I can justify that, because all changes are related to one another.

There were multiple values for keyword argument 'default', which caused the state_dump|save() methods to fails. Additionally, the ZenDaemon code was optimized to make better use of pyzenkit.jsonconf library.

Now it is possible to use this feature in ZenScripts and this also fixed the issue with permissions being dropped too late (the application was fully set up and possible files and/or directories were created with wrong permissions).

Daemon can now take user/group options, which can contain either user/group name as string, or uid/gid as integer. Anything else fails with exception.