Fix .live missing reference with new jQuery builds

```
Uncaught TypeError: Object [object Object] has no method 'live' comments-jquery.min.js:1
(anonymous function) comments-jquery.min.js:1
c jquery.min.js:3
p.fireWith jquery.min.js:3
b.extend.ready jquery.min.js:3
H jquery.min.js:3
```

Above error was being reported when a theme was using 1.9 or higher of jQuery. 1.7 introduced `.on()` instead of different named event bindings. Binding to `document` and passing a selector is the same as `.live()`. As 1.7 is the version of jQuery shipped with the MuraBootstrap theme, are there objections to moving to `.on()` as a replacement for at least `.live()` events?

This is a start, but I count at least 12 other occurrences of `.live()` besides the 2 in this commit. If removing them is okay, I'll add a commit removing the others.

P.S. Will sign the agreement as I get a chance.