A little trick to stop tap breaking browserify

This one is a bit more involved than the last one - and much hackier.

It doesn't make the other reporters work, but it does stop tap from breaking the bootstrap, allowing third party runners to use nodeunit under browserify.

before
```
> browserify index.js | testling

not ok 1 Error: Error: Cannot find module 'inherits' on line 6699
```

after
```
> browserify index.js | testling


```