Provide binary script for grabbing stylish-haskell over the network.

[decentral1se]

Following from #192 - would you be OK with maintaining a simple bash script here that would do the same as the HLint Travis script and grabs the latest binary and pass some args to it? It would allow the usual <get program> | sh -s <pass-args> pattern to make running stylish-haskell pretty easy over the network. We can basically fork the scripts that HLint is using:

1. https://github.com/ndmitchell/hlint/blob/master/misc/travis.sh
2. https://raw.githubusercontent.com/ndmitchell/neil/master/misc/travis.sh

With a usage like in https://github.com/ndmitchell/hlint#running-with-continuous-integration:

curl -sL https://raw.github.com/ndmitchell/hlint/master/misc/travis.sh | sh -s .

I can rig up the scripts if so!

[jaspervdj]

Sounds good, I'd happily merge the scripts if you can rig them up?