Refactored FormReader interface for re-use of data.

- Use FormReader.find().match(formSchema, cb) instead of FormReader.find(formSchema, cb)
- Use FormReader.find().toObject() instead of FormReader.(barcodes|words|checkboxes)
- Use FormReader.find().toImage() instead of FormReader.logImage()
- FormSchema is no more. Use a lean object moving all array elements to Object.fields
Added CLI Tool for easier experimenting.
Added CLI to quick start.
Cleanup.