[#228] Upgraded Piwik plug-in to v0.9.9.10.
[#195] Added git-ignore statement for deployed sitemap.xml file.
This file is generated so we can ignore the deployed version in each environment.
Merge branch 'develop' of https://github.com/akvo/akvo-web into feature/228_site_upgrades
[#228] Upgraded WP to v3.9.1.
Merge pull request #232 from akvo/feature/228_site_upgrades

[#228] Footer fix for Piwik tracking and site upgrades for Piwik plug-in and WP