Equation numbers now appear on right; vertical alignment so-so --

- @mojavelinux, could you look at the code in lines 108-118 of
  converter.rb?  I've inserted CSS manually to put the equation
  number on the right, but there is a problem wth vertical alignment.
  There must be a simple CSS solution --- mine is not good. After
  trying many things that didn't work, I just inserted a negative
  top margin to move the number up -- a bad hack.