/*
 * Set the proxy name and port for the MusicBrainz::Client object.
 *
 * Returns false if MusicBrainz could not connect to the proxy.
 *
 * Aliases:
 *   MusicBrainz::Client#set_proxy
 *
 * Examples:
 *   # connect to 'proxy.localdomain', port 8080
 *   mb.proxy = 'proxy.localdomain'
 *
 *   # connect to proxy.example.com, port 31337
 *   mb.proxy = 'proxy.example.com:31337'
 *
 *   # connect to www.musicbrainz.org, port 8080
 *   mb.set_proxy 'www.musicbrainz.org'
 *
 *   # connect to proxy.example.com, port 31337
 *   mb.set_proxy 'proxy.example.com', 31337
 *
 */
static VALUE mb_client_set_proxy(int argc, VALUE *argv, VALUE self) {