Add layer effects support

```
We would like to have support for layer effects.

We started working on this in a branch in our git fork here : 
https://github.com/inevo/java-psd-library/tree/layer_effects

If you wish we can provide a patch for this. 


```

Original issue reported on code.google.com by `nelson.s...@gmail.com` on 21 Apr 2011 at 11:54
