Added 'scheme' to Request with matcher and test

vcr/matchers.py

@@ -13,6 +13,10 @@ def host(r1, r2):
     return r1.host == r2.host
 
 
+def scheme(r1, r2):
+    return r1.scheme == r2.scheme
+
+
 def port(r1, r2):
     return r1.port == r2.port
 

vcr/request.py

@@ -15,6 +15,10 @@ class Request(object):
         tmp[key] = value
         self.headers = frozenset(tmp.iteritems())
 
+    @property
+    def scheme(self):
+        return urlparse(self.uri).scheme
+
     @property
     def host(self):
         return urlparse(self.uri).hostname