The web ui does not sort columns of numerical data correctly

```
What steps will reproduce the problem?
1. Open the webapp on a caliper invocation that has a numeric param value
2. Sort the column for the number

What is the expected output? What do you see instead?
I would expect the numbers to be sorted like this

1
3
20

instead i see

1
20
3

What version of the product are you using? On what operating system?

Head version of caliper, in chrome

Please provide any additional information below.

```

Original issue reported on code.google.com by `lu...@google.com` on 6 May 2013 at 6:13