Interpolation within quoted strings or attribute values is not highlighted

[deathaxe]

<![CDATA[string {{value}}!]]>

<!-- generic attributes -->
<div width="{{width}}px">

<!-- class attributes -->
<div class="{{class}}-name">

<!-- CSS attributes -->
<div style="{{prop}}-name: {{value + " >

Already have a fix prepared, requires #32 merged to avoid conflicts.