Add option to updater for specifying deps-update type (only pip possible tho)
For updater: allow apt/itude-deps-update if version syntax is simple
In updater: Only get commit-hash from git-show output regardless of default format
In updater: Reorder and improve comments
In updater: improve handling of serving files locally
For updater: clarify dryrun description in help-message
For updater: fix quoting bug
Merge pull request #46 from rowanthorpe/improve-update-script

Improve update script
Add a static maintenance page.

Actual usage of this page remains to the administrator however some
documentation has been added. Closes #47
Merge pull request #49 from akosiaris/master

Add a static maintenance page.