update to savon 2.0

[rubiii]

hey boris,

not sure if you're interested in this, but if you are, i could come up with a pull request for you.

i only see one problem with this: since savon 2.0 requires nori 2.0, washout would need to depend on nori 2.x for this. i think the best way to solve this would be to pin nori to 1.x for the next bugfix release (to fix #77) and upgrade the dependency to 2.x for the next major/minor release.

let me know what you think.

cheers,
daniel

[inossidabile]

Hello Daniel :)

Since wash_out might already be broken without explicit version specified I don't see any reasons to make a bugfix release. At least If I will be able to handle the migration quickly. I'm on it already.