message: make slack api calls a debug issue not a log issue
diff: @@ -244,7 +244,7 @@ module.exports = function(bot, config) {
  function postForm(url, formData, cb, multipart) {
  cb = cb || noop;
  - bot.log('** API CALL: ' + url);
  + bot.debug('** API CALL: ' + url);
  var params = {
  url: url,
  headers: {
  