Support http(s)_proxy ENV variables

Closes issue #65

lib/wayback_machine_downloader/archive_api.rb

@@ -4,9 +4,13 @@ module ArchiveAPI
 		request_url = "http://web.archive.org/cdx/search/xd?url="
 		request_url += url
 		request_url += parameters_for_api page_index
-    request_uri = URI.parse request_url
-    response = Net::HTTP.get_response request_uri
-    response.body
+
+        request_uri = URI.parse request_url
+        Net::HTTP.new('web.archive.org', nil).start { |http|
+            request = Net::HTTP::Get.new request_uri
+            response = http.request request
+            response.body
+        }
 	end
 
 	def parameters_for_api page_index
@@ -28,4 +32,4 @@ module ArchiveAPI
     parameters
   end
 
-end
+end