LB-706: Add div container around embeded iframe, in youtube posts

Update html for youtube/soundcloud items.
Merge pull request #167 from petrjasek/lb-706-youtube-wrap

LB-706: Add div container around embeded iframe, in youtube posts
LB-709: Creator's name is absent from Embed URL

Fixed.
Added also the minified versions.
Merge pull request #168 from nistormihai/liveblog-14

LB-709: Creator's name is absent from Embed URL