Record Multiple Matching Requests

This change allows us to record multiple matching requests to
the same URL, and then play them back sequentially.

Closes #40, #41

tests/integration/test_multiple.py

@@ -0,0 +1,20 @@
+import pytest
+from urllib2 import urlopen
+import vcr
+
+
+def test_making_extra_request_raises_exception(tmpdir):
+    # make two requests in the first request that are considered
+    # identical (since the match is based on method)
+    with vcr.use_cassette(str(tmpdir.join('test.json')), match_on=['method']):
+        urlopen('http://httpbin.org/status/200')
+        urlopen('http://httpbin.org/status/201')
+
+    # Now, try to make three requests.  The first two should return the
+    # correct status codes in order, and the third should raise an
+    # exception.
+    with vcr.use_cassette(str(tmpdir.join('test.json')), match_on=['method']):
+        assert urlopen('http://httpbin.org/status/200').getcode() == 200
+        assert urlopen('http://httpbin.org/status/201').getcode() == 201
+        with pytest.raises(Exception):
+            urlopen('http://httpbin.org/status/200')