Tighten up whitespace in exported pdfs
Add margin top to headings and only show question text if it doesn't match the section title
Allow question paragraphs to split across pages
Move generated by text to footer of pdf
Add page numbering to pdf
Merge origin/master into export/pdf-whitespace
Merge remote-tracking branch 'origin/export/space-used' into export/pdf-whitespace
Merge remote-tracking branch 'origin/export/space-used' into export/pdf-whitespace
Merge remote-tracking branch 'origin/export/space-used' into export/pdf-whitespace
Take different heading sizes into account when guesstimating space used.
Don't reduce the line-height as it makes mutliline headings hard to read
Merge pull request #110 from uoldmp/export/pdf-whitespace

LGTM