Allows action methods to accept a block that returns settings

Basically, so this can happen:

context X do
  base_uri "http://www.google.com/"
  get do
    { path: "/", query: { s: "riot news" } }
  end
end

This will be useful later
Can now save responses by name within a context

... and then you can use those responses for other requests in the same
context. Wooo.
Bumping to v0.0.9