Remove FIXME comment that no longer applies

Changed code to use sub-class of Person instead of Person to avoid the problem where Person was already created with a different base_uri.

spec/ld4l/foaf_rdf/configuration_spec.rb

@@ -56,7 +56,6 @@ class DummyPerson < LD4L::FoafRDF::Person
         end
       end
 
-
       it "should return value of configured base_uri" do
         LD4L::FoafRDF.configure do |config|
           config.base_uri = "http://localhost/test_config/"
@@ -84,6 +83,7 @@ class DummyPerson < LD4L::FoafRDF::Person
     end
   end
 
+
   describe "LD4L::FoafRDF::Configuration" do
     describe "#base_uri" do
       it "should default to localhost" do
@@ -105,5 +105,4 @@ class DummyPerson < LD4L::FoafRDF::Person
       end
     end
   end
-
 end

spec/ld4l/foaf_rdf_spec.rb

@@ -22,7 +22,6 @@ class DummyPerson < LD4L::FoafRDF::Person
     end
 
     it "should use configured value in Person sub-class" do
-      # FIXME fails if run with all tests because LD4L::FoafRDF::Person is already loaded by other tests with a different base_uri
       p = DummyPerson.new('1')
       expect(p.rdf_subject.to_s).to eq "http://localhost/test/1"
     end