Add in white-list functionality to client auth filter.

Defaulted off. When `node['repose']['client_auth']['uri_regex']`
is true, it lets you bring a regex to bypass client auth filter.
Controlled via `node['repose']['client_auth']['uri_regex']`.
Version bump 2.2.0
:thumbsup: :beers:

Added Nick as an author. :trollface:
Merge pull request #10 from filler/add_whitelist_support

Add authn uri whitelist support