Add support for Cpanel::JSON::XS

[colinnewell]

Since the introduction of Cpanel::JSON::XS we have been seeing a lot of test/usage failures with CouchDB::Client on new machines as it explicitly declares which JSON modules it allows JSON::Any to load. This means that the new CPANEL one isn't an option and so no decode method if available.

Couldn't find a decoder method. at /root/.cpanm/work/1386596231.1268/CouchDB-Client-0.09/blib/lib/CouchDB/Client.pm line 9.
BEGIN failed--compilation aborted at /root/.cpanm/work/1386596231.1268/CouchDB-Client-0.09/blib/lib/CouchDB/Client.pm line 9.
Compilation failed in require at t/15-client.t line 7.
BEGIN failed--compilation aborted at t/15-client.t line 7.
t/15-client.t ........ 

I've just tweaked your JSON::Any declaration to add CPANEL (first since it's supposed to be the most recently bug fixed) and to ensure that a new enough version of JSON::Any is installed to know about the Cpanel version.