Update ncs_navigator_authority.

Previous versions relied on faraday_stack 0.1.5, which had a gemspec
containing characters that made Rubygems-under-JRuby quite sad.

In particular, you'd get errors like this:

    Psych::SyntaxError: (<unknown>): 'reader' unacceptable character ''
    (0x87) special characters are not allowed
    in "'reader'", position 164 at line 0 column 0