fix silent syntax error

I don't know what this could be related to, but my first guesses are jquery and coffeescript. I'm running jquery 1.9.1 and coffee-rails 3.2.2 (coffee-script: 2.2.0, coffee-script-source: 1.4.0).

Anyhow, when I click a link with a `data-confirm`, no confirmation is opening and I'm being sent straight through to the link's href. Stepping through in the debugger, I can see that twitter-bootstrap-rails-confirm's compiled js is exploding here:

```
$('\
      <div class="modal hide" id="confirmation_dialog">\
        <div class="modal-header"><button type="button" class="close" data-dismiss="modal">×</button><h3>...</h3></div>\
        <div class="modal-body"></div>\
        <div class="modal-footer"><a href="#" class="btn cancel" data-dismiss="modal">...</a><a href="#" class="btn proceed btn-primary">...</a></div>\
      </div>\
    ')
```

with the error:

```
Error: Syntax error, unrecognized expression: <div class="modal hide" id="confirmation_dialog"> <div class="modal-header"><button type="button" class="close" data-dismiss="modal">×</button><h3>...</h3></div> <div class="modal-body"></div> <div class="modal-footer"><a href="#" class="btn cancel" data-dismiss="modal">...</a><a href="#" class="btn proceed btn-primary">...</a></div> </div>
```

I was able to resolve this by removing the leading and trailing carriage returns inside the string.