VERSION CONTROL FOR THINGS

This pull request adds version control for things.
If anyone has objections to my zone checking "fix" (described below), please voice them.

***Tests have not been written. They will be in a separate pull request because we need to get this branch merged.***

---

- [x] Get `bindbuild` and `dhcp_build` working
- [x] Verify that syslog output makes sense and shows up "correctly" (ident, etc.)
- [x] Simplify logging
- [x] Call `named-checkzone` on new zones and not old ones
- [x] Determine what `BINDBUILD['bind_prefix']` is supposed to do