Added PATCH HTTP method to the docs
AJAX, CSRF & CORS documentation
Fix link to django docs.
Typo
Update docs/tutorial/1-serialization.md

Update for tutorials (manual serialization) to support HTTP PATCH method (partial update of instance)
Example custome permission.  Fixes #299.
Example custom throttle. Fixes #300.
Example custom authentication.  Fixes #301.
Tweak description of example throttle.
Note auto_now, auto_now_add behavior.  Refs #622.
Merge pull request #621 from mktums/patch-1

Update docs/tutorial/1-serialization.md
Revert comment.
And link to quickstart.
Added @mktums for docs fix in #621.  Thanks!
Drop unneccessary `source=` argument.
Notes on upgrading and versioning.  Fixes #620.
Undo changes in browsable-api.md and browser-enhancements.md
Merge branch 'upstream_master' into docs_patch_method

Conflicts:
	docs/api-guide/authentication.md
Merge pull request #592 from wronglink/docs_patch_method

Added PATCH HTTP method to the docs
Login page styles fix. Closes #618. Made with :cookie: