Removed unicode literals for Python 3.2 support
Added python 3.2 to tox settings
Added python 3.2 support to readme
Added python 3.2 to travis settings
Make sure names of edit handler types are bytestrings and not unicode
Cast edit handler type names to str before passing into type()

On python 2, these need to be bytestrings and on python 3 they need to be unicode. So casting to str is a good fit.
Ditto for WagtailAdminModelForm class
Merge branch 'python3-take2-unicode-literals' of https://github.com/kaedroho/wagtail into kaedroho-python3-take2-unicode-literals
add py32-dj16-sqlite to the list of tox environments that fail due to iteritems in South
Merge branch 'kaedroho-python3-take2-unicode-literals'