Adds custom post helper methods.
Implements video single.
Updates video single w/ new data scheme.
Adds thumbnail support.
Implements video listing on travel single.
Merge branch 'master' of github.com:memuller/viagemcultural_theme

* 'master' of github.com:memuller/viagemcultural_theme:
  Videos list
  Tips & episodes list

Conflicts:
	single-video.php