Let JSONEncoder handle Numpy data types.

json.JSONEncoder cannot serialize Numpy data types. Numpy arrays
and array scalars have a tolist() method which casts the object to
a standard python data type.
Merge pull request #1108 from rbose85/master

Typo in strings referring to Python package, django-filter.
Fixed #1105 -- Add hook for custom context in `BrowsableAPIRenderer`.

Replace hard coded response status check with `allow_form` context
variable, so that it can be overridden in a custom renderer class.
Refs #1109 -- Update docs. Integrate changes from feedback.
Merge pull request #1109 from thirstydigital/tickets/1105-renderer-context

Fixed #1105 -- Add hook for custom context in `BrowsableAPIRenderer`.
Added @mrmachine.  Thanks!

For work on #1109.
Merge pull request #1107 from dpretty/master

Let JSONEncoder handle Numpy data types.
Update release notes.
Fixing simple typo
Merge pull request #1115 from soncco/patch-1

Fixing simple typo
Clear cached serializer data on `save()` + test. Fixes #1116.
Correct typo in doc string.
Merge pull request #1117 from carltongibson/#1116

Clear cached serializer data on `save()` + test. Fixes #1116.
Mindnumbingly trivial single-char typo.
Merge pull request #1124 from johnmee/patch-1

Mindnumbingly trivial single-char typo.
Match docs to current code.
Merge pull request #1125 from gkapkowski/patch-1

Match docs to current code.