highlightSpans only works with specific languages?

[ratnanil]

I'm trying to use highlightSpans with bash and python, but it only seems to work with ruby (I've yet only tested the three mentioned languages).

see also: http://jsfiddle.net/uwa6drht/4/

my code:

html:

<textarea id="source">

### Testing `highlightSpans` with different code blocks

code block with `ruby`:

```ruby
`foo` bar

code block with bash:

`foo` bar

code block with python:

`foo` bar

code block without specification:

`foo` bar

js: 
```javascript
var slideshow = remark.create({
  highlightSpans: true
});

output: