Play MPEG-DASH by default.

Add dash.js and videojs-dash files

site/dashjs/AUTHORS.md

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+# Dash.js Authors List
+#####Please add entries to the bottom of the list in the following format
+* @GitHub UserName (Required) [Name and/or Organization] (Optional)
+
+#Authors 
+* @nweber [Digital Primates]
+* @jefftapper [Jeff Tapper, Digital Primates]
+* @KozhinM [Mikail Kozhin, Microsoft Open Technologies]
+* @kirkshoop [Kirk Shoop, Microsoft Open Technologies]
+* @wilaw [Will Law, Akamai Technologies]
+* @AkamaiDASH [Dan Sparacio, Akamai Technologies]
+* @dsilhavy [Daniel Silhavy, Fraunhofer Fokus]
+* @greg80303 [Greg Rutz, CableLabs]
+* @heff [Steve Hefferman, Brightcove]
+* @Tomjohnson916 [Tom Johnson, Brightcove]
+* @jeroenwiljering [Jeroen Wijering, JWPlayer]
+* @bbcrddave [David Evans, BBC R&D]
+* @bbert [Bertrand Berthelot, Orange]
+* @vigneshvg [Vignesh Venkatasubramanian, Google]
+* @nicosang [Nicolas Angot, Orange]
+* @PriyadarshiniV
+* @senthil-codr [Senthil]
+* @dweremeichik [Dylan Weremeichik]
+* @aleal-envivio 
+* @mconlin
+* @umavinoth
+* @lbonn
+* @mdale [Michael Dale, Kaltura]
+* @sgrebnov [Sergey Grebnov, Microsoft Open Technologies]
+* @wesleytodd [Wes Todd, Vubeology]
+* @colde [Loke Dupont, Xstream]
+* @rgardler [Ross Gardler, Microsoft Open Technologies]
+* @squapp
+* @xiaomings
+* @rcollins112 [Rich Collins, Wowza]
+* @timothy003 [Timothy Liang]
+* @JaapHaitsma
+* @72lions [Thodoris Tsiridis, 72lions]
+* @TobbeMobiTV [Torbjörn Einarsson, MobiTV]
+* @TobbeEdgeware [Torbjörn Einarsson, Edgeware]
+* @mstorsjo [Martin Storsjö]
+* @Hyddan [Daniel Hedenius]
+* @qjia7
+* @waqarz
+* @WMSPanel [WMSPanel Team]
+* @matt-hammond-bbc [Matt Hammond, BBC R&D]
+* @siropeich [Siro Blanco, Epic Labs]
+* @epiclabsDASH [Jesus Oliva, Epic Labs]
+* @adripanico [Adrian Caballero, Epic Labs]