fixes the build by disabling path traversal protection for this test

Seems that this test is in direct competition with the desired
behaviour of path traversal protection.
Merge pull request #806 from JonRowe/disable_path_traversal_protection_for_path_test

Disable path_traversal protection for handling encoded slashes test.
Merge branch 'master' of https://github.com/sinatra/sinatra into fix-Request#accept-no_method_error

* 'master' of https://github.com/sinatra/sinatra:
  fixes the build by disabling path traversal protection for this test