Make is_simple_callable consider fields which have default arguments
Added a serializer TimeField
Added tabs between object form and generic content form on PUT/PATCH form

Some extra behaviour to `BrowsableAPIRenderer` to handle PATCH form.
Added PATCH button on generic content PUT form.
Tabs between object form and generic content form on PUT/PATCH form wich are
both allways visible now.

Fix #570
Refs #591
Python 2.6.5+ required
Drop unused import.
Note python compatibility.
Merge pull request #660 from pelme/timefield

Added a serializer TimeField
Merge pull request #657 from dgaus/master

Make is_simple_callable consider default arguments
Update release notes.
Added @pelme, for TimeField addition.

Refs #660.
Mention caching.  Closes #659.
Added tests for PATCH form in the Browsable API
POST form using new form.html template
Added tabs between object form and generic content form on POST form
Fix typos.
Fix typos.
Fix docstring
Don’t use my old nickname in credits.
Merge pull request #668 from paulmillr/patch-1

Don’t use my old nickname in credits.
Update link to @paulmillr.  Refs #668.