Fix travis failure randomly, because Capybara.default_wait_time is too short.

spec/spec_helper.rb

@@ -16,6 +16,7 @@ require 'email_spec'
 require 'sidekiq/testing/inline'
 require 'capybara/poltergeist'
 Capybara.javascript_driver = :poltergeist
+Capybara.default_wait_time = 10
 
 # Requires supporting ruby files with custom matchers and macros, etc,
 # in spec/support/ and its subdirectories.