The updated script now outputs GeoJSON; imagery outlines have been verified/cleaned up

## Updated outlines

I have updated the master branch to include all Bing Batch 10 and Bing Batch 11 outlines. I have also verified/cleaned up the older Bing outlines.

Note: I noticed that in your pull request, there seems to be new OrbView outlines. I don't think I have incorporated this yet.

## GeoJSON

I have replaced osm2json.pl with osm2geojson.pl. The data.js file now includes a GeoJSON representation of the outlines data. Note that data.js contains a wrapper JavaScript code:

```javascript
var data = <GeoJSON object>
```

So if you want a pure GeoJSON file, just delete the `var data = ` part and rename data.js to data.json.