[#191] Re-enabled Piwik tracking in footer.
Merge branch 'develop' of https://github.com/akvo/akvo-web into fix/191_footer
Merge branch 'develop' of https://github.com/akvo/akvo-web into fix/191_footer
Merge pull request #229 from akvo/fix/191_footer

[#191] Fix to re-enable Piwik site tracking