Adjust the unit-tests for the change of /api/projects/wiki/
Fix case for the PEAR and PECL backends

Fixes https://github.com/fedora-infra/anitya/issues/45
Fix case for the PyPI backend

Fixes https://github.com/fedora-infra/anitya/issues/45
Match backend case insensitive

Fixes https://github.com/fedora-infra/anitya/issues/45
Adjust the unit-tests for the case changes in the backends