Prepend the swagger routes instead of appending.

[nimpsch]

First of all thank you for your great package, it works very well!

Why the change?

When using a static file handler, the swagger routes will be appended to the routes list. Therefore, the static file handler doesn't work anymore.

Current way to fix the issue:

routes = [  
        tornado.web.url(r'/api2', Handler2),  
        tornado.web.url(r'/api', Handler)
    ]  
setup_swagger(routes=routes)  
routes.append(tornado.web.url(r'/(.*)', tornado.web.StaticFileHandler, {'path': 'path'}))  
swagger_app = tornado.web.Application(routes)

Proposal:

Prepend the swagger handler instead of appending.

Desired result:

routes = [  
    tornado.web.url(r'/api2', Handler2),  
    tornado.web.url(r'/api', Handler),  
    tornado.web.url(r'/(.*)', tornado.web.StaticFileHandler, {'path': 'path'})  
]  
setup_swagger(routes=routes)  
swagger_app = tornado.web.Application(routes)

For the failing build:
Gitlab Issue

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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