Fix error using blueprints

Fixes an error which occurs when using Blueprints and multiple routes
with the same name but different parameters.

    AssertionError: View function mapping is overwriting an existing
    endpoint function: blueprint.hello

Below is an example code listing to demonstrate how to reproduce the
error.

web.py

    from flask import Flask
    from blueprint import blueprint

    app = Flask(__name__)

    app.register_blueprint(blueprint)

    if __name__ == "__main__":
        app.run()

blueprint.py

    from flask import Flask
    from flask import Blueprint
    from flask_sillywalk import SwaggerApiRegistry
    from flask_sillywalk import ApiParameter
    from flask_sillywalk import ApiErrorResponse

    blueprint = Blueprint('blueprint', __name__,
                            template_folder='templates')

    registry = SwaggerApiRegistry(
      blueprint,
      baseurl="http://localhost:5000",
      api_version="1.0",
      api_descriptions={})
    register = registry.register
    registerModel = registry.registerModel

    @register("/hello/")
    def hello_blank():
        return "Hello World!"

    @register("/hello/<name>/")
    def hello_name(name):
        return "Hello " + name + "!"

This fixes when using blueprints with no prefix, when using blueprints
with prefixes the URLs returned to not contain the prefix.