Merge pull request #645 from abhinavc/master

Defined a new environment - attachment - for large data-tables and diagrams
Merge pull request #646 from abhinavc/master

Sharpened logic for handling attachments
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 )