Make predicate mismatches not hide other possible valid views.

This is mostly an issue for REST style views that use request_method
predicates and are registered for context interfaces.

See Issue #409
Change log note.
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
Add some tests for how content types and HTTP "Accept" header handling
behave.
Merge branch 'master' of github.com:Pylons/pyramid
add failing test for callable acl
support acl as a callable
reorder some imports to be alphabetical
Merge branch 'feature.callable-acl'
Merge branch 'master' of latteier/pyramid into pull.786
Merge branch 'master' of github.com:Pylons/pyramid
Merge branch 'pull.786'
add test to ensure unrelated views are not invoked after PredicateMismatch
Merge pull request #920 from msabramo/accept-tests

Add some tests for how content types and HTTP "Accept" header handling behave.
Fixes #798: Allow a protocol-relative URL to be passed to add_static_view, generate URLs using the current protocol.
Merge branch 'master' of github.com:Pylons/pyramid