initial work at being more ansible. sort of. all inventories in one place which will share group vars. environments get groups, and these are expressed in the new inventory files, now with more than just "localhost". clusters get child groups with their overrides. Still more to make it go
add ami_role to groups in dynamic adds. cleanup group vars a little bit. needed to add group stubs for all the groups in inventory to make it work. update buri to reference new inventory locations. This should mostly fix up #27 I think.
make sure we set buri_environment from buri