Refactor project to new name

The name of the project is being refactored from Privacy Revolver to
Farside. The reasoning behind this is:
1. A shorter name is easier to remember
2. It can stand for "FOSS alternative redirecting service" (which I know
doesn't encapsulate all letters from "farside", but it's close enough).

This commit also includes improvements to the update script for
determining how far along the script is.

test/farside_test.exs

@@ -1,8 +1,8 @@
-defmodule PrivacyRevolverTest do
+defmodule FarsideTest do
   use ExUnit.Case
   use Plug.Test
 
-  alias PrivacyRevolver.Router
+  alias Farside.Router
 
   @opts Router.init([])