Errors from ready() promise do not contain status code

[rijk]

More info in #165.

While trying to find a way to catch errors during instantiation of the player, we found the following workaround:

player = new Vimeo.Player( ... )
player.ready().catch(...)

However, the errors thrown here are of appalling quality; they just contain a message, no code, no name. Therefore, attempting to interpret these errors to produce a more understandable error message for the user would force us to use a brittle system of running a regex on the error message.

Expected Behavior

The errors thrown by the ready() method follow the loadVideo() API.

Actual Behavior

Useless error.

Steps to Reproduce

player = new Vimeo.Player( ... ) // with private or deleted video (403/404)
player.ready().catch(...)

[luwes]

The player.ready() method should now have promise rejections with more detailed error messages during initialization. NotAllowedError, PrivacyError, for the rest Error.