Modifications to get code to compile / run

This isn't a true PR, I'm mainly trying to get your code to work.  So far it compiles but I'm getting some weird errors when I try to run it.

Try 1: Rename resp.so to resp2.so
```
psi4 input.dat
Traceback (most recent call last):
  File "<string>", line 28, in <module>
ImportError: dynamic module does not define init function (initresp2)
```

Try 2: Rename resp2 to resp in input file
```
psi4 input.dat
Traceback (most recent call last):
  File "<string>", line 28, in <module>
  File "../resp/__init__.py", line 15, in <module>
    psi4.plugin_load(sofile)
RuntimeError: load_plugin: Cannot find symbol: resp0B
```

Let me know what you think.