Handle htdigest file properly in contrib.wsgi

Fix #90
Handle htdigest file properly in contrib_autoreload.wsgi

Fix #90
Change make_app to make_autoreloading_app in contrib_autoreload.wsgi

Fix #90
Merge pull request #91 from philipdexter/master

Handle htdigest file properly in contrib.wsgi
Update CHANGELOG.rst
Add robots.txt

Thanks to @lb1a for the initial patch.