Implement --color and --no-color options.

To force terminal colors on/off.

Fixes: #348
Add --warnings-exit-nonzero option.

Forces exiting with code 2 when warnings present.

Fixes: #347
Improve warning when commenting parent class member.

As suggested by Meg.
Switch to new script for including vimeo videos.

Vimeo now provides an iframe.  The good part is that within this
they do their own Flash detection and say to you when you are
missing Adobe Flash.

Also less code, althogh it's an iframe.
Update the testcase also for vimeo change.
Up version to 4.8.0.
Merge tag 'v4.8.0' of https://github.com/senchalabs/jsduck into sencha

Tagging 4.8.0 release.

Conflicts:
	template/app/view/videos/Container.js