By: Addison Wylie When a family favourite reaches for a sequel, the franchise has to be careful it doesn’t catch a case of contagious sequelitis.  For the much anticipated second part of the How to Train Your Dragon series, I’m happy to report that this latest adventure only suffers from slight sniffles.  Otherwise, this is the follow-up that the 2010 hit deserves. We’re reunited with Hiccup (voiced by Jay Barachel) and his colourfully named pals…