Add support and specs for Headers#include? and #key?.

Author: ioquatix

lib/protocol/http/headers.rb

@@ -157,6 +157,8 @@ def include? key
 				self[key] != nil
 			end
 
+			alias key? include?
+			
 			def keys
 				self.to_h.keys
 			end

spec/protocol/http/headers_spec.rb

@@ -66,6 +66,18 @@
 		end
 	end
 
+	describe '#include?' do
+		it "should include? named fields" do
+			expect(subject).to be_include('set-cookie')
+		end
+	end
+	
+	describe '#key?' do
+		it "should key? named fields" do
+			expect(subject).to be_key('set-cookie')
+		end
+	end
+	
 	describe '#fields' do
 		it 'should add fields in order' do
 			expect(subject.fields).to be == fields