Relax railtie version so we can use foundation 2.2.1.2 w/rails 4

It totally works fine and now we don't have to update the CSS.

Author: Carol Nichols

foundation.gemspec

@@ -21,6 +21,6 @@ Gem::Specification.new do |s|
   # specify any dependencies here; for example:
   # s.add_development_dependency "rspec"
   # s.add_runtime_dependency "rest-client"
-  s.add_runtime_dependency "railties", ">= 3.1.0", "< 4.0"
+  s.add_runtime_dependency "railties", ">= 4.0"
   s.add_runtime_dependency "jquery-rails", ">= 1.0"
 end