Merge pull request #50 from lukecyca/tarsnap-warning-fix

Tarsnap warns about leading /

roles/tarsnap/tasks/tarsnap.yml

   file: state=directory path=/usr/tarsnap-cache
 
 - name: Install nightly Tarsnap cronjob
-  cron: name="Tarsnap backup" hour="3" minute="0" job="/usr/local/bin/tarsnap --cachedir /usr/tarsnap-cache --keyfile /root/tarsnap.key -c -f backup-`date +\%Y\%m\%d` /home /root /decrypted /var/www /var/log /var/lib/mysql > /dev/null"
+  cron: name="Tarsnap backup" hour="3" minute="0" job="/usr/local/bin/tarsnap --cachedir /usr/tarsnap-cache --keyfile /root/tarsnap.key -c -f backup-`date +\%Y\%m\%d` -C / home root decrypted var/www var/log var/lib/mysql > /dev/null"