Merge branch 'develop' of git://github.com/melinath/philo into develop

* 'develop' of git://github.com/melinath/philo:
  Tweaked AttributeMapper._fill_cache to also store values on the Attribute instance itself. Made everything about AttributeMapper._fill_cache lazier.
  Lazy-eval the values of AttributeValues instead of loading them all during AttributeMapper._fill_cache.
  Removed Node.render_to_response select_related call since it is not clearly more efficient. Delayed page evaluation in FeedView.page_view to the end of the inner function.
  Added a 'contributing' page to the philo docs. This is meant primarily as an initial effort, which can be expanded upon more later.
  Corrections to Blog.entry_tags to use taggit APIs. Tweaks to penfield migration 0005 because of South issue 428 (and some incorrect filters obscured by that issue.)
  Minor correction to EmbedWidget.js to handle window names with dashes.
  Overrides TemplateField widget on admin container forms instead of on the ModelAdmin.
  Reverted TemplateField parent to models.TextField and moved EmbedWidget into philo.admin.widgets. Added EmbedWidget use on the appropriate ModelAdmins. Cleaned up ContentletAdmin and ContentReferenceAdmin.
  Removed TagCreation.js and the admin widget that used it.
  Added django-taggit extra requirement to setup.py.
  Removed oberlin references.
  Removed references to oberlin-specific models.
  Initial philo commit to use django-taggit instead of native tags.
  Moved to a more flexible BlogView method arrangement which leverages the general presence of the results of get_object to better provide certain functionality.