Esprima minification options have never worked

[gfwilliams]

for(var i in passes){if(!options[i]){delete(passes[i])};}

doesn't do anything to pipeline!

We could probably remove this, and the pipeline could be changed now too:

https://github.com/estools/esmangle/blob/90bf70752292064aecd33160a5c9cb0308038079/lib/pass.js#L54

[gfwilliams]

Fixed with https://github.com/espruino/EspruinoTools/commit/a1493a2146455bc151da003113101a665bce0b50