html answers evaluated correctly

[Amrita1991]

this resolves the problem i mentioned in #43 where answers containing html tags are evaluated falsely. this pull request solves this by stripping html tags and comparing the correct answer with user given one as plain texts

[marcusgreen]

Thank you, I should have some time to look at this after this week (though I will be tempted in the mean time)

[marcusgreen]

I don't think will work because the distractors are written to the question_answers tables with html tags stripped. The problem is I cannot see where the stripping happened. I was expecting it to be a bit like

    $stripexcptions = "<hr><a><b><i><u><strike><font>";

and then $stripexceptions is fed as a second parameter to striptags, though that cannot be correct as it doesn't contain a
^{If you can find where tags are being stripped from the distrators/wrong answers, it might be able to make a working patch.}

[Amrita1991]

I understand your point. I tried to look for where the stripping happens too but wasnt successful. I will look again.
However, just to remind you this PR doesnt correct the distractors. My aim here is to correct the situation when a student drags the correct answer into the gap but it gets evaluated wrong if the correct answer has html tags in it.