'Layr', 'Lr16' and 'Lr32' start at See Layer info. 

"'Layr', 'Lr16' and 'Lr32' start at See Layer info. " writted in http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/#50577409_pgfId-1031423. But you write 

``` ruby
if %w(Lr16 Lr32 Mt16).include?(key)
```

in `layer_mask.rb`.  
I think something may be wrong here.

Thanks :)
