Fix for Ubuntu 12.xx and no method .blank?

 * Upgraded to tinder 1.9.2 (fixes eventmachine build failure on Ubuntu)
 * Rebuilt gemspec to update tinder
 * Switcehd from .blank? to (var || "").empty? (.blank? is from
   ActiveSupport which is not included here -- not even sure how this was working for anyone)
 * Removed extra whitespace

Please build and release when merged for extra awesomeness. :) Thanks!