Fix mismatch between package name

If you run `npm list` on master you'll see it complain about the mismatch between the package name in `package.json` and `node_modules/imagemagick/package.json`:

```
Jons-MacBook-Pro:uploadfs jon$ npm list
uploadfs@0.3.1 /Users/jon/Dropbox/Sites/uploadfs
├── async@0.1.22
├── imagemagick@0.1.3 extraneous
├─┬ knox@0.4.7
│ ├── mime@1.2.9
│ └─┬ xml2js@0.2.6
│   └── sax@0.4.2
├── mkdirp@0.3.5
├── UNMET DEPENDENCY node-imagemagick https://github.com/boutell/node-imagemagick/tarball/master
├─┬ request@2.12.0
│ ├─┬ form-data@0.0.3
│ │ ├── async@0.1.9
│ │ └─┬ combined-stream@0.0.3
│ │   └── delayed-stream@0.0.5
│ └── mime@1.2.7
├─┬ rimraf@2.0.3
│ └── graceful-fs@1.1.14
└── underscore@1.4.4
```