Mostplayed commands and new config options

Added mostplayed command
Addded multiple config options: websiteUrl, enablingVoting, enableChat,
welcomeNewDjs, disabledCommands.
Added configManager (configMgr) as wrapper around calls to config
properties: configMgr.get('configProperty', defaultValue).

For new bot.js to run, you must defined websiteUrl in the config file. I have provided a wrapper around config and used it in several places, but not for websiteUrl.