Temporary files are not getting cleaned up on exit

```shell
$ bbin-dev --version
bb --deps-root /Users/rads/src/bbin --config /var/folders/tt/73f6l1j971n03fsxstmz_g280000gn/T/bbin158 -f /Users/rads/src/bbin/bbin --
bbin 0.2.4-SNAPSHOT

$ cat /var/folders/tt/73f6l1j971n03fsxstmz_g280000gn/T/bbin158
{:deps {local/deps {:local/root "/Users/rads/src/bbin"}}}
```