Merge pull request #842 from adamarla/master

fixed questions
Re-written solution ...

Old solution was verbose
Merge pull request #843 from abhinavc/master

Re-written 2/sph/guz9z
[cron-git-commit] @ 07.31
rewritten
Merge pull request #844 from abhinavc/master

rewritten 2/kzg/au7zr`
re-written
Merge pull request #845 from abhinavc/master

Re-written 2/zyg/hco8i
corrected solution
Merge pull request #846 from abhinavc/master

Corrected 2/42h/ydjcf
Create JPEGs by default for quizzes and vault/

Generate PNGs only in vault/
Merge pull request #847 from abhinavc/master

JPEGs by default in vault/ and mint/. PNGs only in vault/
Merge remote-tracking branch 'upstream/master'