Edited Issue: Jade syntax highlighting does not understand JS expressions in attribute values [1775]

The syntax highlighter for jade has some small issues.

For the following codes, if you remove the spaces around the operators, they haven't the same colors anymore:
```jade
body(class=authenticated ? 'authed' : 'anon')
body(class=authenticated?'authed':'anon')
```
```jade
a(href='/home/' + index) Home
a(href='/home/'+index) Home
```
The last line in the second example will also screw up every following code syntax highlight!