Increase Poltergeist timeout in specs

This is to try to avoid flaky js specs in Travis

spec/rails_helper.rb

@@ -26,6 +26,7 @@ end
 
 Capybara.register_driver :poltergeist do |app|
   Capybara::Poltergeist::Driver.new(app,
+    timeout: 1.minute,
     inspector: true, # allows remote debugging by executing page.driver.debug
     phantomjs_logger: File.open(File::NULL, "w"), # don't print console.log calls in console
     phantomjs_options: ['--load-images=no', '--disk-cache=false'],