Added a warning for Firefox users
Add backup font for Windows
Don’t use dataset attribute for IE10 compatibility
Added a help page
Added a <details> warning for IE users
Added a section to help.html: “Just 3 Things? Really?”
Thanks Elina!
Moved import/export to a new “data” page
Merge branch 'refs/heads/master' into gh-pages

Conflicts:
	3things.appcache