Update thin to v1.6.1

Author: Chris Hunt

github-auth.gemspec

@@ -26,7 +26,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rake',           '~> 10.1.1'
   spec.add_development_dependency 'rspec',          '~> 2.14.1'
   spec.add_development_dependency 'sinatra',        '~> 1.4.4'
-  spec.add_development_dependency 'thin',           '~> 1.5.1'
+  spec.add_development_dependency 'thin',           '~> 1.6.1'
 
   spec.add_runtime_dependency 'httparty', '~> 0.12.0'
   spec.add_runtime_dependency 'thor',     '~> 0.18'