Fix some gulp task issues

I know, I've been fixing up the gulp scripts all week. I keep fixing one thing then breaking another.

In this commit, I fix some issues with some previous approaches.

I no longer try to do the copying to `chrome` after `firefox`, I simply stream to both during copy and build tasks, and that logic is reused during dev and build tasks.

The `copyTask` function now supports an array of `destinations`, that allows piping to multiple destinations, which is pretty cool.

The `manifest:cleanup` task that chrome requires is now just part of the `copy` task, so we don't have to remember it everywhere we copy. So obvious it's like why only now.

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