Check on element existence

Sometimes there is a mistake, - if the element isn't created.
Merge pull request #87 from ange007/patch-3

Check on element existence
Merge pull request #93 from robinnorth/feature/misc-improvements

Trigger player error if YouTube API fails to load
Merge pull request #94 from robinnorth/feature/toggle-on-click

 Added `toggleOnClick` option parameter to control behaviour of video on click
Added `forceHTML5` option
Updated minified version
Added forceHTML5 and forceSSL
Merge branch 'master' into develop

Conflicts:
	src/media.youtube.js
Fix error in check for undefined/null player parameters