Feature/update faraday

**Background:** In version `0.8`, `faraday` introduced a breaking change with the way that array and
hash attributes are cast into query strings. This broke a large number of our use cases. The issue is
supposedly fixed in `0.9`, or at least configurable. The first step in testing this with our apps is to get
all of our supporting gems updated to allow the newer versions. Hence this PR.

cr @bmiller-bluekai @antonbk @jamespolanco @kevinelliott