adding resource router macro. closes #12

```elixir
resource "/path", Controller
```

expands to

```elixir
get     route,                controller, :index
get     route <> "/new",      controller, :new
post    route,                controller, :create
get     route <> "/:id",      controller, :show
get     route <> "/:id/edit", controller, :edit
put     route <> "/:id",      controller, :update
patch   route <> "/:id",      controller, :patch
delete  route <> "/:id",      controller, :delete

options route do
  {:ok, var!(conn) |> resp(200, "") |> put_resp_header("Allow", "HEAD,GET,POST") |> send_resp}
end
options route <> "/new" do
  {:ok, var!(conn) |> resp(200, "") |> put_resp_header("Allow", "HEAD,GET") |> send_resp}
end
options route <> "/:_id" do
  {:ok, var!(conn) |> resp(200, "") |> put_resp_header("Allow", "HEAD,GET,PUT,PATCH,DELETE") |> send_resp}
end
options route <> "/:_id/edit" do
  {:ok, var!(conn) |> resp(200, "") |> put_resp_header("Allow", "HEAD,GET") |> send_resp}
end
```

this falls back to Plug.Router's options macro. need to make a better wrapper macro for options in Sugar.Router. ideal syntax would be

```elixir
options route, allowed_methods
```