Supports builtin NODE_VERSION from Makefile, Colony v from package.json.

Closes #627.
Merge #633 r=@tcr: Supports builtin NODE_VERSION from Makefile, Colony v from package.json.

e.g. test output should now be

```
1..2
# {"node":"v0.10.32","colony":"v1.0.0"}
ok 1 - node version reports >= 0.10.30
ok 2 - colony version reports >= 1.0.0
```

See #627.