Add min/max values for check_setting_int/float (#3409)

* Use min_max when loading naming configuration on SickRage init.

Fixes https://github.com/SickRage/SickRage/issues/1373#issuecomment-286937172

* add min/max values to check_setting_int/float (+update tests)

* add docstrings for check_setting_*

* Use try_int when saving naming on savePostProcessing
Plural of anime is anime, not animes
Default to the radio option with value "3" when NAMING_ANIME is None
Fixes #1373

* min -> min val & max -> max_val

* missed some. thank you Travis!