Adds dubious fix for a possible error with loadTransform

Hello @substack et al,

I have a issue that I don't totally understand and a fix that I don't totally understand either :stuck_out_tongue:. Perhaps by explaining the issue and showing the fix here someone can tell me what I've done wrong (or maybe what I've done right).

Here's the issue: I have an express app (let's call it B), that uses Browserify and the [strictify](https://github.com/jsdf/strictify) plugin in a gulp task to bundle front-end JavaScript. Usually this works just fine. Then, for reasons I'd rather not get into, it made sense for B to be exported as a module into another express app (let's call it A), and used as middleware. (To make it's assets available, B has a postinstall script to run gulp.)

B has dependencies that are mostly non-overlapping with A's dependencies, except for underscore. As a result, running `npm install` on A puts underscore in A/node_modules and not in A/node_modules/B/node_modules.

In this arrangement, running the B's gulp task results in this error:

```
events.js:7
    throw er; // Unhandled 'error' event
        ^
Error: Cannot find module 'strictify' from '/home/zachrose/A/node_modules/underscore'
    at /home/zachrose/A/node_modules/B/node_modules/browserify/node_modules/resolve/lib/async.js:50:17
    at process (/home/zachrose/A/node_modules/B/node_modules/browserify/node_modules/resolve/lib/async.js:119:43)
    at /home/zachrose/A/node_modules/B/node_modules/browserify/node_modules/resolve/lib/async.js:128:21
    at load (/home/zachrose/A/node_modules/B/node_modules/browserify/node_modules/resolve/lib/async.js:60:43)
    at /home/zachrose/A/node_modules/B/node_modules/browserify/node_modules/resolve/lib/async.js:66:22
    at /home/zachrose/A/node_modules/B/node_modules/browserify/node_modules/resolve/lib/async.js:21:47
    at Object.oncomplete (fs.js:107:15)
```

After some trial and error, I discovered this change to module_deps, in addition to that adding `{basedir: __dirname}` as an option to my transform, like so:
```
    browserify({ /* yadda-yadda */}).transform('strictify', {basedir: __dirname})
```
...prevents the error and seems to make everything work ok.

So here are my questions:

* What is the dirname option to b.transform supposed to do? Is it supposed to give a place to start looking for the transforming module (e.g. strictify?)
* If not, is there another way I should be resolving my problem?

Thanks!