Overriding variation across page loads

[ccallebs]

There doesn't seem to be a way to override variations across page loads. It'd be helpful to have a dashboard button next to the variation to do this.

I can take point on this if it's a welcome feature.

[andrew]

@ccallebs that sounds good, PR to review would be sweet

[ccallebs]

@andrew Opened a PR, sorry it took me a month. Better late than never. :)

[ccallebs]

@andrew I'm closing this since the feature is in master now.