make test on fresh clone failes due to undeclared dependencies

# Steps to reproduce

```
git clone https://github.com/caolan/nodeunit.git
cd nodeunit
make test
```

# Expected behaviour

All tests pass

# Actual behaviour

```
nodejs ./bin/nodeunit test
module.js:471
throw err;
^

Error: Cannot find module 'ejs'
at Function.Module._resolveFilename (module.js:469:15)
at Function.Module._load (module.js:417:25)
at Module.require (module.js:497:17)
at require (internal/module.js:20:19)
at Object. (/home/matthew/Documents/Projects/nodeunit/nodeunit/lib/reporters/junit.js:18:11)
at Module._compile (module.js:570:32)
at Object.Module._extensions..js (module.js:579:10)
at Module.load (module.js:487:32)
at tryModuleLoad (module.js:446:12)
at Function.Module._load (module.js:438:3)
Makefile:148: recipe for target 'test' failed
make: *** [test] Error 1
```

# Commentary

The make script should run `npm install ejs` and `npm install should`, since those are dependencies.

I'm new to nodejs and Make files, so I'm not quite sure how to do this.

Beginne mit dem Test-Target im Makefile um Zeile 148 und prüfe, wie Abhängigkeiten deklariert oder installiert werden. Reproduziere den Fehler bei einem frischen Clone, berücksichtige die fehlenden Abhängigkeiten ejs und should und bestätige, dass make test ohne manuelle Installation erfolgreich ist.

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