Template:Tech talk video/doc

Usage
{	"params": { "link": { "description": "Link to the video", "example": "https://www.youtube.com/watch?v=sWiDimlK4bE", "type": "string", "required": true },		"date": { "description": "Date of the video, in ISO8661 YYYY-MM-DD format.", "type": "date", "suggested": true, "example": "2015-10-19" },		"title": { "description": "Title of the tech talk (without quotation marks).", "example": "Free and open source licensing at Wikimedia", "type": "string", "required": true }	},	"description": "Displays a sentence that links to a tech talk video." }

To do

 * Add parameters for presenter, slides, webm, etc. to conditionally output: "– presenter name, (slides) (webm video)". See Tech talks.
 * could be an interwiki link to commons (though usually we offer this as well as YouTube). The template should use Module:String's  to check if url starts with "http", something like (untested):