josh meekings handball should have been a penalty and a red card .
if the penalty was awarded and converted celtic would have gone to 2-0 .
caley manager john hughes admitted his side were fortunate in win .
virgil van dijk scored celtic 's opener with a superb free-kick .
celtic keeper craig gordon was sent off early in the second half .
greg tansey , edward ofere and finally daven raven scored for caley .