Merge pull request #991 from ericbuehl/master

pedantic doc updates
Modified documentation for CSRF as mentioned in #984
Merge pull request #993 from kevin-brown/issue_984_docs

Made the CSRF documentation more clear
Updated EmailField error message. This one already available in django translations.

https://github.com/django/django/blob/master/django/conf/locale/ru/LC_MESSAGES/django.po#L343
Fixed test
added script block to list of blocks

Phew, was afraid I wouldn't be able to overwrite this section..
Merge pull request #996 from speg/patch-1

added script block to list of blocks
Merge pull request #995 from pzinovkin/patch-1

Updated EmailField error message.
Add @pzinovkin for #995 thanks!
Add support for removing field files by sending an empty string
Fix *Throttle class names in the docs

* AnonThrottle -> AnonRateThrottle
* UserThrottle -> UserRateThrottle
* ScopedThrottle -> ScopedRateThrottle
* (cosmetic) removed one errant whitespace character

Fixes #1006.
Merge pull request #1007 from willkg/throttle-docs-fix-1006

Fix *Throttle class names in the docs
Add @willkg for #1007 thanks!
Fixed reversed arguments in assertion
Added to the credits
Merge pull request #1010 from kevin-brown/issue_1008

Fixed arguments in assertion
Fix Tutorial5 serializers.py typo

[Issue #N/A]

A slight typo at Tutorial5 causing an Exception "name 'models' is
not defined". A subtle one that can confuse Python/Django noobs
like me.
Merge pull request #1011 from coderigo/docs

Fix Tutorial5 serializers.py typo
Add @coderigo for #1011 thanks!
Docs about migrations and `post_save`.

Documentation detailing requirement to migrate prior to running `createsuperuser` if using an authtoken `post_save` signal.
Closes #987.  Thanks to @yprez.