Use query endpoint URI scheme to configure SSL.

Issue #64 - Use SSL for SPARQL queries where the scheme of the query
endpoint URI is https rather than expecting the default SSL port of
443.

lib/tripod/streaming.rb

@@ -6,7 +6,7 @@ module Streaming
 
     def self.create_http_client(uri, opts)
       client = Net::HTTP.new(uri.host, uri.port)
-      client.use_ssl = true if uri.port.to_s == "443"
+      client.use_ssl = uri.scheme == 'https'
       client.read_timeout = opts[:timeout_seconds] || 10
       client
     end

spec/tripod/streaming_spec.rb

@@ -58,13 +58,24 @@
         end
       end
 
-      context 'https URI with default https port' do
-        let(:client) { Tripod::Streaming.create_http_client(URI('https://localhost:443/sparql/query'), {}) }
+      context 'https URI with default port' do
+        let(:client) { Tripod::Streaming.create_http_client(URI('https://localhost/sparql/query'), {}) }
         it 'should use ssl' do
           expect(client.use_ssl?).to eq(true)
         end
       end
 
+      context 'https with non-default port' do
+        let(:client) { Tripod::Streaming.create_http_client(URI('https://localhost:4433/sparql/query'), {}) }
+        it 'should use ssl' do
+          expect(client.use_ssl?).to eq(true)
+        end
+
+        it 'should use specified port' do
+          expect(client.port).to eq(4433)
+        end
+      end
+
       context 'with read timeout option' do
         let(:read_timeout) { 5 }
         let(:client) { Tripod::Streaming.create_http_client(URI('http://localhost/sparql/query'), {:timeout_seconds => read_timeout}) }