Django-tables2

- Fix regression that caused column verbose_name values that were marked as
safe to be escaped. Now any verbose_name values that are instances of
SafeData are used unmodified.

- Fix regression in `SingleTableMixin`.
- Remove stray `print` statement.

- `SingleTableView` now uses `RequestConfig`. This fixes issues with
`order_by_field`, `page_field`, and `per_page_field` not being honored.
- Add `Table.Meta.per_page` and change `Table.paginate` to use it as default.
- Add `title` template filter. It differs from Django's built-in `title` filter
because it operates on an individual word basis and leaves words containing
capitals untouched. **Warning**: use `{% load ... from ... %}` to avoid
inadvertently replacing Django's built-in `title` template filter.
- `BoundColumn.verbose_name` no longer does `capfirst`, capitalizing is now the
responsibility of `Column.header`.
- `BoundColumn.__unicode__` now uses `BoundColumn.header` rather than
`BoundColumn.verbose_name`.

- Fix version in `setup.py`

- Add support for column attributes (see Attrs)
- Add `BoundRows.items()` to yield `(bound_column, cell)` pairs
- Tried to make docs more concise. Much stronger promotion of using
`RequestConfig` and `{% querystring %}`

- Removed random 'print' statements.
- Tweaked `paleblue` theme css to be more flexible:
- removed `whitespace: no-wrap`
- header background image to support more than 2 rows of text