terraform: don't use Meta node anymore
terraform: remove meta nodes
terraform: expand resource nodes at walk time
config: Count can be a string (for interpolation)
config: validate unknown var in count
config: add Config method
terraform: more tests passing
terraform: properly discover count orphans
terraform: walk the resource properly for destroy
terraform: Validate expands properly
config: fix gob encode/decode for raw config and keys
terraform: dependencies in the graph from count properly show up
teraform: test that count can be a variable
terraform: counts can't be computed
config: validate that only proper variables can be in the count
terraform: remove jank computed check for count
config: validate that count is an int
terraform: validate count is non-negative
terraform: test count == zero
terraform: test count = 1 variable access