Add CLI flag for enabling debug logging

lib/logger.js

@@ -24,6 +24,11 @@ var Logger = module.exports = {
     var logger = Config.logging.logger,
         level  = Config.logging.level || "info";
 
+    // --debug CLI flag overrides any other option
+    if (_.includes(process.argv, "--debug")) {
+      level = "debug";
+    }
+
     logger = (logger == null) ? BasicLogger : logger;
 
     this.logger = logger || NullLogger;