Install php5-common, instead of php5 package.

Install php5-common in order not to install Apache2.

This commit fixes #156.
Merge branch 'id/156' into dev
Making sure that the owner of /var/www/nginx-default/domain/wordpress is www-data:root.

This commit fixes #157.
Merge branch 'id/157' into dev
Add logging facility to twitter notification script.

This commit fixes #154.
Merge branch 'id/154' into dev
Merge commit '8533a48c492e96667681d478bdbe27e6d67ad272' into HEAD