Closes #2355.

Normally a serializer won't need these arguments on __init__, but
if a user has customized __init__ they may expect them to be available.

fix the serializer widget style formatting documentation

First pass at refactoring get_field_info in utils.model_meta

Typo manger => manager

Use textarea input for 'models.TextField'.

Compress invalid template

manage.py compress —force causes a warning here.

manage.py compress —force causes a warning here.

Documented an optional argument of HyperlinkedIdentityField

lookup_url_kwarg argument of HyperlinkedIdentityField wasn't documented

use of double quotes broke the code highlighting.

Use custom ListSerializer for pagination if required.

Better behavior with null and '' for blank HTML fields.

Ability to customize method names without creating a custom router