Merge pull request #821 from tshepang/path

some pyramid.path API doc improvements
Merge pull request #820 from tshepang/master

some renderers and view API doc improvements
Merge pull request #817 from tshepang/renderers

some improvements to narrative docs of Renderers
Merge pull request #815 from tshepang/temp

some pyramid.config API documentation improvements
use the more appropriate directives
this obsolete info should have been removed in commit 22ed77d
Merge pull request #834 from tshepang/obsolete

this obsolete info should have been removed in commit 22ed77d
Merge pull request #833 from tshepang/directives

use the more appropriate directives
Updated gunicorn information
Document PredicateMismatch for exception contexts
Update documentation for include_ip

Add a note that using the include_ip functionality with IPv6 is not a
good idea due to the users network expiring IPv6 addresses quickly.

See preferred lifetime/valid lifetime for routers doing SLAAC in IPv6
for more information.
Add test for AuthTktCookieHelper for IPv6 compat

Add an extra test that sets environ['REMOTE_ADDR'] to an IPv6 address
"::1".
Add tests for AuthTicket/parse_ticket for IPv6 compat

Add some simple tests that test IPv6 compatibility with the AuthTicket
class and the parse_ticket function.
Fix IPv6 compatibility in calculate_digest()

This is a quick fix for adding IPv6 compatibility so that if the
AuthTktAuthenticationPolicy is used with include_ip enabled then it
won't throw an error.
Sign CONTRIBUTORS.txt
use clearer language
simplify and shorten an overlong sentence
remove questionable sentence

I could not tell whether it was meant to be humorous, or if it simply was a mistake. Regardless, I think it does not add much. If Speed needs to be defended, perhaps something better would do. For now, I remove.
fix and shorten broken sentence
unuglify Unix Python installation instructions