fix a copied-and-pasted comments
add .panel-default class to panel
wrap .media-heading and .comment-meta in a div with .panel-heading class
add .panel-body class to .comment-content
move footer's html markup in the comment_reply_link function

This avoid empty footers when the comment has the max depth
add bootstrap pager in previous and next posts links
Merge pull request #7 from giofilo/master

A better panel's markup and posts navigation