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.