Add opt/models/lib to LD_LIBRARY_PATH
Add opt/models/lib to LD_LIBRARY_PATH

With this change, I can now instantiate Hydrotrend:

```
In [1]: from cmt.components import Hydrotrend
In [2]: h = Hydrotrend()
In [3]:
```
csdms/wmt-exe,csdms/wmt-exe,csdms/wmt-exe,csdms/wmt-exe