Upgrade to Rails 5.0

Closes #377

config/initializers/new_framework_defaults.rb

@@ -0,0 +1,25 @@
+# Be sure to restart your server when you modify this file.
+#
+# This file contains migration options to ease your Rails 5.0 upgrade.
+#
+# Once upgraded flip defaults one by one to migrate to the new default.
+#
+# Read the Guide for Upgrading Ruby on Rails for more info on each option.
+
+Rails.application.config.action_controller.raise_on_unfiltered_parameters = true
+
+# Enable per-form CSRF tokens. Previous versions had false.
+Rails.application.config.action_controller.per_form_csrf_tokens = true
+
+# Enable origin-checking CSRF mitigation. Previous versions had false.
+Rails.application.config.action_controller.forgery_protection_origin_check = true
+
+# Make Ruby 2.4 preserve the timezone of the receiver when calling `to_time`.
+# Previous versions had false.
+ActiveSupport.to_time_preserves_timezone = true
+
+# Do not halt callback chains when a callback returns false. Previous versions had true.
+ActiveSupport.halt_callback_chains_on_return_false = false
+
+# Configure SSL options to enable HSTS with subdomains. Previous versions had false.
+Rails.application.config.ssl_options = { hsts: { subdomains: true } }