Look through the deleted documentation and fill in missing bits

[jonathan-s]

While revamping the documentation for django I chose to delete some documentation, there are still some nuggets of wisdom in this deleted documentation. Like topics that could need django specific documentation.

So take a look at this commit: 4609530

And fill in some of those missing bits.

Also see #24 for some deletions.

[jonathan-s]

A note on the usage of flash messages in reflexes. They do not work, and cannot work. If you want to use flash messages, create an intermediary view that redirects to the right view. The intermediary view will add the flash message and redirect to the correct view.