Added Enable and Disable messages to console

If needed to remove:
public final Logger logger = logger.getlogger("UserRewards");

this.logger.info(pdfFile.getName() + " v" + pdfFile.getVersion() + "Has been Enabled!");
		this.logger.info("Thank you for choosing UserRewards by HenzQ!");
		this.logger.info("Check for updates @ http://dev.bukkit.org/bukkit-plugins/userrewards/");