Fixes an new features

[synw]

I fixed a few things:

• Unicode issue when deleting a feed
• Timezone localization on dates
• More simple and efficient documentation

And added some features:

• Added a max number of posts to retrieve setting
• Added a base_template setting (and removed the confusing site_base stuff)
• View and templatetag for categories
• Support for the Huey async backend for updates (more easy to setup than Celery)
• Option to display or not a feed in the main view (=> added a field in the Feed model)
• Made the setting PLANET_USER_AGENT optional

I also removed the South migrations support and the Bootstrap Pinax theme requirement

And I plan to do this:

• Fix the tests with reversed urls
• Improve the search (and remove the context processor), probably using django-watson
• Categories refactoring using mptt
• Better default templates with navigation links

The idea is to get a usable module out of the box with minimum efforts from the user.

Check it here: master...synw:master