Merge pull request #19 from ZUKSev/hotfix/python3_hashing

Fixed hashing on pyhton3 by encoding the email
Fixed confirm_id database field length
Typo
Improved security by adding the current timestamp to the confirm_id hash
Moved tracking url in settings

By skipping the definition of the PIWIK_ULR or by setting it to None,
the tracking code could be completely removed.
Merge pull request #22 from ZUKSev/fix/newsletter_subscribtion

Fix/newsletter subscribtion
Added configuration variable for the piwik site id
Merge pull request #23 from ZUKSev/feature/external_services_configuration

Moved tracking url in settings
Merge pull request #25 from ZUKSev/develop

Release 1.2.0