better inline-videos parsing

[Sudrien]

#147 suggested adding youtube.be support, there is room for further improvements.

• Force embed to https - testing shows youtube will do this anyways, might as well take away one opportunity to spoof urls.
• Support t= - or, embeds can be started at a certain time during the video

Caveats:

• t=#h##m##s is not the format used in embeds - rather, it's start=### - a single integer, in seconds ( see https://developers.google.com/youtube/player_parameters#start ). At least t= uses a consistent order, so a single regex to break them out should be enough.
• Looking at multiple url parameters or unknown order means we really should be doing proper url & parameter parsing - something complex enough to be a part of Candy.Util, or use an external library.

[Sudrien]

Want to get down results of experimenting, no push request code yet.

args.message = jQuery.parseHTML(args.message).map(function(a) {
  if(a.outerHTML){ //dom element of any sort
    switch(a.hostname) { // a link with an href
      case "youtube.com":
      case "www.youtube.com":
        return a.search; //do iframe replacement here, v= important, t= needs conversion if exist
        break;
      case "youtu.be":
        return a.pathname + a.search; //do iframe replacement here, pathname important, t= needs conversion if exist
        break;
      default:  //undefined - not a link
        return a.outerHTML;
      }
    }
  else { //this is a string that has to be wrapped in somthing
    return a.textContent;
    }
  }).join("");

[Sudrien]

Pushed first attempt to branch. I'm wondering if I should be displaying the original URL or a sanitized one - leaning towards sanitized, but not very hard. @mweibel - is this code looking good to you?

(note to self: remove debug console calls)

[Sudrien]

Pushed second attempt, in response to @benlangfeld 's comments.
Also added Vimeo support - it's a site I find myself linked to frequently enough.

[benlangfeld]

Go ahead and open a PR, mark it WIP and hold discussion there @Sudrien. It's easier to review and comment then :)