Video.js 6.x compatibility and fixes

[GeyseR]

I would like to propose changes from our team to be merged into the main repository:

• make possible to register Vimeo tech for Video.js 6.x version (tested on 6.2.5)
• skip updating stored current time for progress event from player (buffered number of seconds stored separately)
• trigger loadedmetadata event after loaded event was fired inside player

[ymhuang0808]

This works for me (on 6.2.7). Thanks.

[KhanMaytok]

Can anyone merge this?

[GeyseR]

Added additional fix for deprecation warning about using videojs.createEl

[wells]

Is this repo no longer maintained @gkatsev?