Gifs not uploaded properly.

Nobody has claimed this yet.

I'm trying to upload a gif to S3. Users can upload gifs from a form-like interface. If I write one of these uploaded gifs to disk from Node then it appears fine, without any issues.

Then when I upload the gif to S3, there are strange black frames between each of the normal frames in the gif ([example](http://wildfire-profile-photos.s3.amazonaws.com/default_1419648534572.gif)).

My imager config is

```
module.exports = {
variants: {
items: {
// keepNames: true,
resize: {
default: "250x250"
}
}
},

storage: {
Local: {
path: "/var/www/"
},
S3: {
key: 'key',
secret: 'secret',
bucket: 'wildfire-profile-photos',
storageClass: 'REDUCED_REDUNDANCY',
secure: false,
}
}
};
```

I was wondering if there were any additional settings for gifs, or any other caveats for using gifs.

Thanks very much for your help!

Start by reproducing the GIF upload through the Node imager configuration and compare the file written to disk with the version uploaded to S3. Done means the S3-hosted GIF preserves its normal frames without black frames and any relevant GIF-specific caveats are documented.

Written by the indexing model from the issue text.