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.

Start with the Makefile test target around line 148 and inspect how dependencies are declared or installed. Reproduce the fresh-clone failure, account for the missing ejs and should dependencies, and confirm that make test passes without manual installation.

Written by the indexing model from the issue text.