Remove unused Pool methods: create_anonymous/options/id_to_name (#3206)

* Pool.id_to_name: never used.
* Pool.create_anonymous: never used.
* Pool.options: unused since e7aff87.

test/unit/pool_test.rb

@@ -53,10 +53,6 @@ class PoolTest < ActiveSupport::TestCase
     should "be mapped to a pool id" do
       assert_equal(@pool.id, Pool.name_to_id(@pool.id.to_s))
     end
-
-    should "be mapped to its name" do
-      assert_equal(@pool.name, Pool.id_to_name(@pool.id))
-    end
   end
 
   context "Reverting a pool" do
@@ -317,16 +313,4 @@ class PoolTest < ActiveSupport::TestCase
       assert_nil(@p3_neighbors.next)
     end
   end
-
-  context "An anonymous pool" do
-    setup do
-      user = Timecop.travel(1.month.ago) {FactoryGirl.create(:user)}
-      CurrentUser.user = user
-    end
-
-    should "have a name starting with anon" do
-      pool = Pool.create_anonymous
-      assert_match(/^anon:\d+$/, pool.name)
-    end
-  end
 end