Added cache expiration

Added cache expiration after 1 day

First pymedusa released version

This fork of simpleanidb is maintained and used by the pymedusa organisation.
The library is used as an api to communicated with anidb.info. The following anidb interfaces are used:

• The anime-list.xml (https://raw.githubusercontent.com/ScudLee/anime-lists/master/anime-list.xml).
• The anime-titles.xml dump (http://anidb.net/api/anime-titles.xml.gz).
• The anidb http api. https://wiki.anidb.net/w/HTTP_API_Definition.

The following additional changes have been made compared to the forked base code:

• Added usage of the anime lists, like the Hotanime and Random recommendations.
• Refreshing of the cache.
• Providing an existing cache directory as parameter.
• Lots op pep8 improvements.