Add TimeHelper::getDaysSinceJanFirst
Add Utils::getPopularityIndex
Add insight-eoy and insight-wide class to insight if it's EOY
[WIP] New insight: EOY Most favliked post of the year
closes #2133

Add Post tpl that includes retweet/fave/reply counts in a header

TODO:
Style post counts total
Staging: Test EOY Most Favliked