Backported fix for Visible/Reduced Credit Enabled checkboxes always being marked.
Fixed bug 2708 by commenting out tikz option
Merge branch 'hotfixes' into devupdates
Tweaked behavior of an Achievement Item
Fixed a couple of bugs with gateway/quizes

- In math4 gateway.template didn't have the right bootstrap path
- GatewayQuiz.pm didn't include Base64.js which was causing knowls based solutions to fail.