Hello,
I prepared a small patch to make ox-html use 'class' attribute instead
of 'align' in caption element when it is used in tables.

The reason is simple, according to xhtml1 Strict specification 'caption'
element doesn't have 'align' attribute, this is true for HTML5 too.
Instead of 'align' attribute it is more cleanly to use 'class' attribute
and to add corresponding entries to CSS.

In included patch I didn't add word TINYCHANGE because I don't is it
small or not (I don't understand what exactly the phrase
> your total contribution (all patches you submit) should change less than
> 15 lines
means, how lines are counted).

---
WBR, Vladimir Lomov

-- 
Never argue with a man who buys ink by the barrel.