TypeError: Cannot read property 'eyeglass' of null

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I was following the README's documentation for [creating an eyeglass module](https://github.com/sass-eyeglass/eyeglass#writing-an-eyeglass-module) but I keep running into this error. What am I doing wrong in my setup?

```
TypeError: Cannot read property 'eyeglass' of null
at getModuleName (/Library/WebServer/Documents/my-project/node_modules/eyeglass/lib/modules/EyeglassModule.js:95:43)
at new EyeglassModule (/Library/WebServer/Documents/my-project/node_modules/eyeglass/lib/modules/EyeglassModule.js:32:15)
at /Library/WebServer/Documents/my-project/node_modules/eyeglass/lib/modules/EyeglassModules.js:45:13
at Array.reduce (native)
at new EyeglassModules (/Library/WebServer/Documents/my-project/node_modules/eyeglass/lib/modules/EyeglassModules.js:44:39)
at new Eyeglass (/Library/WebServer/Documents/my-project/node_modules/eyeglass/lib/index.js:26:18)
at Eyeglass (/Library/WebServer/Documents/my-project/node_modules/eyeglass/lib/index.js:18:13)
at Gulp. (/Library/WebServer/Documents/my-project/Gulpfile.js:202:14)
at module.exports (/Library/WebServer/Documents/my-project/node_modules/orchestrator/lib/runTask.js:34:7)
at Gulp.Orchestrator._runTask (/Library/WebServer/Documents/my-project/node_modules/orchestrator/index.js:273:3)
```

Here's the content of the related files, let me know if I'm missing anything.

**Gulpfile.js**

```js
gulp.task('sampleTask', function (cb) {
var sass = require('gulp-sass');
var eyeglass = require('eyeglass');
var sassOpts = {
eyeglass: {
modules: [
{
path: "my-module/"
}
]
}
};

pump([
gulp.src('sample.scss'),
sass(eyeglass(sassOpts)),
gulp.dest('.')
], cb);
});
```

**my-module/eyeglass-exports.js**

```js
"use strict";

module.exports = function(eyeglass, sass) {
return {
functions: {
"hello($name)": function(name, done) {
done(sass.types.String("Hello, " + name.getValue()));
}
}
};
};
```

**my-module/package.json**

```json
{
"name": "my-module",
"keywords": [
"eyeglass-module",
"sass"
],
"main": "eyeglass-exports.js",
"eyeglass": {
"exports": "eyeglass-exports.js",
"needs": "^1.1.2"
}
}

```

Start with eyeglass/lib/modules/EyeglassModule.js at getModuleName, then trace how the module path in Gulpfile.js is loaded. Compare my-module/package.json and eyeglass-exports.js with the README's module format and reproduce the reported stack trace. Done means the setup either works or the documentation and error handling clearly identify the required configuration.

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