Generating 3 variants per version for each question

The 3 variants are ( all jpg )
  1. trim -> just the question text, stripped to the bone
  2. notrim -> just the question text, but on a whole page with whitespace
  3. full -> the question text with the solution ( now in a shaded box )
Merge pull request #647 from abhinavc/master

Now generating 3 variants per version for each question