Redirect root to /shiori/.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Delete unuse urlpattern in core.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Add unittest of routing.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>