Merge branch '546_success_failure_experiment_email_improvement' into 'master'

Improve experiment failure/success notification email

Closes #546

See merge request !323

beat/web/experiments/templates/experiments/failed_experiment_email.txt

@@ -2,7 +2,7 @@ Hello,
 
 The experiment {{ experiment.fullname }} failed to execute properly.
 
-More details: http://{{ site.domain }}{{ experiment.get_absolute_url }}
+More details: http://{{ site.domain }}/login/?next={{ experiment.get_absolute_url }}
 
 Note: You're receiving this email because you are subscribed to receive
 experiment notifications. You may turn them off at your settings page.

beat/web/experiments/templates/experiments/successful_experiment_email.txt

@@ -2,7 +2,7 @@ Hello,
 
 The experiment {{ experiment.fullname }} finished successfully.
 
-More details: http://{{ site.domain }}{{ experiment.get_absolute_url }}
+More details: http://{{ site.domain }}/login/?next={{ experiment.get_absolute_url }}
 
 Note: You're receiving this email because you are subscribed to receive
 experiment notifications. You may turn them off at your settings page.