Add current tag to image

[bobbintb]

AutoSlackPack is based off of the aclemons Slackware image and currently only has one tag, latest, which is Slackware 15.0. However, I believe UnRAID is based off of the current Slackware branch. I'm not sure if it really is a one-to-one translation as far as that goes but the majority of packages on UnRAID at least are from the current branch of Slackware. I also find myself regularly have to change the branch in slackpkg to the current branch and update everything when doing development work in AutoSlackPack. I think AutoSlackPack should add the current tag and have a version based off of the aclemons current branch. Seeing how this is really made for UnRAID development, it might even be preferable to make that the only branch but that may be a bit premature. Maybe the default.