We previously hid the poster image when controls were disabled because
the poster image had a click handler on it. However, this meant that in
the case of Flash, which doesn't have a native poster image ability, we
lost the poster.

Fixes #1625.

This helps with debugging to know what a component's name is.
We try to look up the tech's name via the constructor's name property,
otherwise, we set it to 'Unknown Tech'. Can be overridden by setting
`this.name_` after calling `super()` in the constructor.

Fixes #1786.

Previously, seek bar's mousedown handler would first seek the video,
then pause it. This can trigger a bug in Chrome 55 where seeking
backwards and then immediately pausing can break the video player.

Instead, call the super handler last so that we pause the video before
we start seeking.

Fixes #3839. This reverts commit e92db4f4 (#3886)

For elements which parent doesn't have `hasAttribute` it needs do another check to prevent erroring out. One case of this is when video.js is created inside a documentFragment, the parent node won't have a `hasAttribute` method.

Using aliasify and require, we can generate the dist/video.js and dist/alt/video.novtt.js files each with and without vttjs while having the require-able version of video.js available to require vttjs and have it work with bundlers like browserify and webpack.

A invalid argument (`--w`) was being passed to the babel cli in the grunt task `shell:babel`. This argument has been changed to `--watch` to get the babel cli to watch files for changes as intended.

* Fixed (and simplified) the codecs header.
* Elaborated slightly on codecs and flash in v6
* Changed case of 'Video.js' throughout and some other capilatisation to be consistent with the doc

npm start now runs `grunt dev` which in turn runs the connect server,
sets up babel watching, browserify watching (for both src and test
files), and css and alternate builds watching.

Additionally, it will copy over the dev build files into the dist folder
so that if you're linking videojs and you have a project that gets
video.js from the dist, you can link and develop with more easy without
rerunning all of `grunt dist` each time.

Additionally, this specifically does not run more time consumming
operations like minification.

Fixes #3692.

Introduce the Dom.isReal() function, which makes an educated assumption about the "realness" of the document object.
Wrap code here and there with checks against Dom.isReal() as well as other defensive code.

Fixes #3869.

If using nativeControlsForTouch, skip the emitTapEvents listeners from
being setup. This avoids taps being taken away from native video
elements and stopping controls being displayed.

In chrome 55, something changed which introduced a bug in videojs where
if you seeked back, it wouldn't work. This is because we always paused
the video in the mousedown handler.

Instead, we should create a timer for pausing that is cleared in the
mouseup handler or in the mouse move handler. This is so that if someone
is seeking by clicking and waiting the video pauses. As soon as we start
moving and we get a mousemove event, we can know that it's safe to pause
as well.

Fixes #3839.

Use remark to lint and generate TOC for markdown files.

If the videojs embed code (a video element) is wrapped in a div with the
'data-vjs-player' attribute on it, that element will be used for the
player div and a new one will not be created. In addition, on browsers
like iOS that don't support moving the media element inside the DOM, we
will not need to clone the element and we could continue to re-use the
same video element give to us in the embed code.

This could also be extended in the future to change our embed code to a
div-only approach if we so choose.

If you're in a seeking state and the source changed, we should no longer
be in a seeking state.

Fixes #3765.

The error that is logged in this test makes it hard to see what is an actual error in some cases.

remove edge version so we're always on latest