fix quiz time limit conversion
fix quiz question ordering
import some multichoice questions as multiple answers questions
Merge pull request #54 from maneframe/slash

replace moodle tokens in content (e.g. $@SLASH@$)
fix matching questions and import drag-and-drop matching
Merge pull request #55 from maneframe/misc2

Miscellaneous moodle fixes #2
import wiki activities as pages
Merge pull request #56 from maneframe/wikis

import wiki activities as pages
convert equations to canvas format