Fix url in emails, add frontendURL helper (#19)

Fixes #16

config/environments/test.rb

@@ -7,7 +7,7 @@ require "active_support/core_ext/integer/time"
 
 Rails.application.configure do
   # Settings specified here will take precedence over those in config/application.rb.
-  
+
   config.cache_classes = false
 
   # Do not eager load code on boot. This avoids loading your whole application
@@ -20,6 +20,7 @@ Rails.application.configure do
   config.public_file_server.headers = {
     'Cache-Control' => "public, max-age=#{1.hour.to_i}"
   }
+  config.action_mailer.default_url_options = { :host => 'localhost', port: 3000 }
 
   # Show full error reports and disable caching.
   config.consider_all_requests_local       = true