Pin beaker to < 2.10 in Gemspec

Gemfile

@@ -22,7 +22,7 @@ group :development, :unit_tests do
 end
 
 group :system_tests do
-  gem 'beaker',        :require => false
+  gem 'beaker', '< 2.10',  :require => false
   gem 'beaker-rspec',      :require => false
   gem 'serverspec',        :require => false
 end