Numpy imports 10217

Add try/catch on numpy imports in various scripts.
If numpy is not installed, when you try to get params for a script, you see no parameters returned and a message indicating that numpy is required.

If you still try to run the script, you get a message telling you that numpy was required.

Don't know a nice way to simulate import failure on test server. Locally I just removed the /numpy folder from my filesystem.

![Screen shot 2013-03-14 at 16 10 08](https://f.cloud.github.com/assets/900055/259719/b6b6b8a4-8cc4-11e2-99c9-ad7ed7be5db2.png)

![Screen shot 2013-03-14 at 15 22 55](https://f.cloud.github.com/assets/900055/259716/8ba61830-8cc4-11e2-87ee-80cf66d6bb97.png)