added helper function and request contains

[josephmancuso]

Added a new method to the request: request.contains()

This method can be used like:

# Request: /dashboard/user/edit
def show(self, request: Request):
    if request.contains('/dashboard/user/*'):
        pass

or you can be more explicit:

# Request: /dashboard/user/edit/1
def show(self, request: Request):
    if request.contains('/dashboard/user/edit/*:int'):
        pass

which will match /dashboard/user/edit/1 but not /dashboard/user/edit/joe which is very similar to the matching of the route urls

or

# Request: /dashboard/user/edit/1
def show(self, request: Request):
    if request.contains('/dashboard/user/*:string/*:int'):
        pass

which will match /dashboard/user/edit/1 and /dashboard/user/create/1

#200

[coveralls]

Coverage increased (+0.1%) to 91.234% when pulling b702165 on add-is-to-request into e845591 on master.