link-local IPv6 addresses need a '%interface' specification to be useful
update ownCloud if necessary

this will always download the latest ownCloud and upgrade if ownCloud install dir exist, this apphroach allows us to keep existing user plugins. currently not checking if currently installed version is equal to the one we're downloading as I couldn't find a proper solution for that
fixes comments by @JoshData
this is what I meant
install/upgrade ownCloud 7.0.2

Merge branch 'master' of github.com:jkaberg/mailinabox
showing the mail-in-a-box version might fail if git isn't actually installed

The user might acquire the sources via some means other than a git clone. On Vagrant, the files come in via Vagrant. So test for git before running `git describe`.
show the status of backups in the control panel
set the DNS TTL to 30 minutes rather than 1 day

Also updating the values for secondary DNS, but we're not set up
for secondary DNS so it won't matter.

see #172
Merge branch 'master' of github.com:mail-in-a-box/mailinabox into roundcube_carddav
unzip destination specified