Tango-shared-core

* Fixed setup.py bug that kept dependencies from being loaded reliably.

* Added some template tag tests
* renamed humanize_join to humanized_simple_join
* Included more robust humanized_simple_join that uses get_absolute_url to create a link to the object.

* Moved modernizer to bottom of file. Note that you may want to use a custom modernizr build and put an html5 shim high in the document. {% block htmlshiv %} has been added for that purpose in the base_all template. See http://stackoverflow.com/a/16085479 for details.
* Added humanize_join template filter in formatting tags, to provide nice "apples, oranges, and pears" output.

Added three col thumbnail defaults

Spun admin functionality out to tango-admin

Don't create top assets slideshow unless top assets > 1