Update 'requests' lib to v2.0.

third_party/requests/packages/urllib3/exceptions.py

Index: third_party/requests/packages/urllib3/exceptions.py
diff --git a/third_party/requests/packages/urllib3/exceptions.py b/third_party/requests/packages/urllib3/exceptions.py
index 2e2a259cd63a58210de1f1f6c26649ed9b5ce1f9..98ef9abc7f054d586dc44b08f21476f54b00e79b 100644
--- a/third_party/requests/packages/urllib3/exceptions.py
+++ b/third_party/requests/packages/urllib3/exceptions.py
@@ -39,6 +39,11 @@ class SSLError(HTTPError):
     pass
 
 
+class ProxyError(HTTPError):
+    "Raised when the connection to a proxy fails."
+    pass
+
+
 class DecodeError(HTTPError):
     "Raised when automatic decoding based on Content-Type fails."
     pass
@@ -70,8 +75,29 @@ class HostChangedError(RequestError):
         self.retries = retries
 
 
-class TimeoutError(RequestError):
-    "Raised when a socket timeout occurs."
+class TimeoutStateError(HTTPError):
+    """ Raised when passing an invalid state to a timeout """
+    pass
+
+
+class TimeoutError(HTTPError):
+    """ Raised when a socket timeout error occurs.
+
+    Catching this error will catch both :exc:`ReadTimeoutErrors
+    <ReadTimeoutError>` and :exc:`ConnectTimeoutErrors <ConnectTimeoutError>`.
+    """
+    pass
+
+
+class ReadTimeoutError(TimeoutError, RequestError):
+    "Raised when a socket timeout occurs while receiving data from a server"
+    pass
+
+
+# This timeout error does not have a URL attached and needs to inherit from the
+# base HTTPError
+class ConnectTimeoutError(TimeoutError):
+    "Raised when a socket timeout occurs while connecting to a server"
     pass