169 redux (#200)

* tests each curl example so we can document further #169

* allow any node you want #169

* added expected results, all condenser_api tests pass #169

* display node and version info #169

* extract vars

* added smoke detector for external scripts to use #169

For example, after running the rake task, now you can ask bash for the last return code:

```bash
$ echo $?
```

* [#169] fixing bad merge

* [#169] improve test:curl documentation slightly.