[seam-dev] Seam common module

We need some place to put utility classes that are shared across the other modules, such as Strings, Base64, etc. For now, I've added a common module which is currently very minimal (which we can add to as required), however I'm not sure if this is the way we ultimately want to go. I can't currently think of any alternative though - does anyone else have an opinion on this? If we go down this route, then we will probably be able to do away with the root /common directory and just have modules/common instead. Actually the more I think about it, since we are restructuring everything into modules anyway it doesn't make much sense to have a root common directory at all.