Make the PDF a download and provide a dialogue so people know what's happening.

Fixes #13.
Fix the layout issue where the column offset would continue across the page.

If possible, this makes the PDF renderer code even more ugly.
Move donate button to the top navbar.
Use a different inter-box spacing for the division ballot. This tweak brought
to you by the 16 candidates for Melbourne.
Fix missing row.
Merge branch 'master' into storeshare

Conflicts:
	templates/ballotpicker.haml