Move the default filter to be the last if statement

Otherwise if you only set an exclusion filter it will be ignored and
everything will be documented.

Author: oestrich

lib/rspec_api_documentation/example.rb

@@ -25,9 +25,9 @@ def http_method
 
     def should_document?
       return false if pending? || !metadata[:resource_name] || !metadata[:document]
-      return true if configuration.filter == :all
       return false if (Array(metadata[:document]) & Array(configuration.exclusion_filter)).length > 0
       return true if (Array(metadata[:document]) & Array(configuration.filter)).length > 0
+      return true if configuration.filter == :all
     end
 
     def public?

spec/example_spec.rb

@@ -70,7 +70,7 @@
     end
 
     context "configuration sets a filter" do
-      before do 
+      before do
         configuration.filter = :public
         configuration.exclusion_filter = :excluded
       end
@@ -93,6 +93,24 @@
         it { should be_false }
       end
     end
+
+    context "configuration only sets an exclusion filter" do
+      before do
+        configuration.exclusion_filter = :excluded
+      end
+
+      context "when example doesn't match exclusion" do
+        let(:metadata) { { :resource_name => "foo", :document => :public } }
+
+        it { should be_true }
+      end
+
+      context "when example matches exclusion" do
+        let(:metadata) { { :resource_name => "foo", :document => [:public, :excluded] } }
+
+        it { should be_false }
+      end
+    end
   end
 
   describe "#public?" do