Puckfetcher

* BUGFIXES
* Pin current latest versions of dependencies.
Some big jumps.
* util.sanitize works on windows now,
so let puckfetcher use it.

* DEV
* Use reST docstring format in subscriptions.py,
will later go over the rest.
* Fix some inconsistencies in formatting strings, comments, and logging.
* Make _filter_nums require keyword args and default min_lim.
* Make update require keyword args,
and make it not change any property if the corresponding arg isn't provided.

* BUGFIXES
* Pin current latest versions of dependencies.

* DEV
* Attempt again to generate docs properly with sphinx.

* FEATURES
* Add reload_config command. Reload config file after editing without quitting.

* OTHER
* Fix README.rst.

* BUGFIXES
* If user doesn't supply "album" in metadata, use sub name (expected but etc.).

* BUGFIXES
* Prefer user metatdata per-sub over cache metadata per-sub (expected but not actual
behavior).