Implicit branches cause incorrect routes to be used when methods should not be allowed.

[dreid]

See https://gist.github.com/dreid/5041647

In this case a request to DELETE /collections/<colname>/<itemname> falls through until it gets to delete_collection_branch.

This is bad, what should be a 405 Method not Allowed, results in a successful delete of the collection.

[cyli]

The docstring for test_app.test_branchroute probably needs an update to be that the branch=True option is passed.

Also, should there be a second test case to make sure that whether or not the trailing slash is added, if a branch=True option is passed the implicit branch will be created? Or would that be overkill?

[cyli]

That part of README.rst above where you added branch=True should probably also be updated. Currently it says "If the URL passed to route ends in a / then the returned IResource will also be allowed to handle all children path segments."