Merge pull request #1 from gmp26/master

merged with Mike’s latest
switched old frogs and d3 directive tests back on
Revert "switched old frogs and d3 directive tests back on"

This reverts commit f971c55512a67bf48dfd8a5b966e3cdf5e7aa328.
fixed numerical answers for circumscribed circle mathmo questions
frogs and d3 tests on again
Merge branch 'alexwlchan-master'