Fixed bug #25

Fixed bug #25 
Is it a valid use case for the job to be disabled but have an interval unit that is not `none`? If not, then we can perhaps simplify this to something like the following:

```Java
String postData;
if(enabled && !intervalUnit.equals("none")) {
  postData = "{ \"status\": \"enabled\" .. and all the rest of the code here";
} else {
  postData = "{ \"status\": \"disabled\" }";
}
```