Remove rtfd.org redirect in SubdomainMiddleware.

Since nginx now handles all rtfd.org redirects, this redirect
logic is no longer needed in middleware.
Merge pull request #570 from toffer/remove-middleware-rtfd-redirect

Remove rtfd.org redirect in SubdomainMiddleware.
Correct link to pip requirements
Merge pull request #572 from gliptak/patch-1

Correct link to pip requirements
Added style note
Fix an issue on some systems where SITE_ROOT was set incorrectly
Remove djangome middleware test.

Test is unnecessary since djangome functionality has been removed.
Fix typo in test_middleware filename.
Document SSL support on CNAMEs
Fix list
Rejigger index order
Tweak page hierarchy

Version control support matrix is a subhead under Versions, no?
Merge pull request #583 from whit537/patch-7

Tweak page hierarchy
Rewrite "Versions" section

This rewrite explains how to use the Versions feature from the user's point of view. I took out the overly apologetic verbiage about accepting patches (I think being open to patches goes without saying).

P.S. Is hard-wrapping okay? I'm editing TTW on GitHub over here ...
Merge pull request #584 from whit537/patch-8

Rewrite "Versions" section
Prune "Updating" from version control matrix

Per IRC w/ @ericholscher
Merge pull request #586 from whit537/patch-10

Prune "Updating" from version control matrix
Merge pull request #574 from DanielOaks/sphinx_rtd_theme_note

Added note about the sphinx_rtd_style, building locally and on RtD
Merge pull request #577 from toffer/fix-middleware-tests

Fix middleware tests
Merge pull request #575 from DanielOaks/site_root_realpathfix

Fix an issue on some systems where SITE_ROOT was set incorrectly