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

 * Upgraded to tinder 1.9.2 (fixes build failure on Ubuntu)
 * Rebuilt gemspec to update tinder
 * Removed extra whitespace
 * Switcehd from .blank? to (var || "").empty? (.blank? is from
   ActiveSupport which is not included here)
Merge pull request #1 from ericboehs/master

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