Use force_text() on widget values just like django.forms.widgets do.

This is important for comparing the correct choice in a modelchoicefield
using an select or radio widget.
Merge branch 'master' into fix/force_text_widgets

* master:
  We do need badges, after all!
  sphinx it up
  block that code!
  Use sphinx betterer
  Added template docs. Moved changelog into docs
  Bumped version to 2.0.6 Updated changelog
  Add details of string lookups
  Don't peg micro versions
  Add docs for flat_attr filter
  Update to release version of Django 1.6
  Add support for field lookup by name
  Add docs
  Add regression test for #10
  Load formulation in default template
  Updated changelog
  Update readme

Conflicts:
	formulation/templatetags/formulation.py
Merge pull request #12 from julianwachholz/fix/force_text_widgets

Use force_text() on select/checkbox widget choice values