Update 'requests' lib to v2.0.

third_party/requests/packages/urllib3/exceptions.py

 # urllib3/exceptions.py
 # Copyright 2008-2013 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
 #
 # This module is part of urllib3 and is released under
 # the MIT License: http://www.opensource.org/licenses/mit-license.php
 
 
 ## Base Exceptions
 
 class HTTPError(Exception):
@@ skipping 21 matching lines @@
     def __reduce__(self):
         # For pickling purposes.
         return self.__class__, (None, self.url, None)
 
 
 class SSLError(HTTPError):
     "Raised when SSL certificate fails in an HTTPS connection."
     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
 
 
 ## Leaf Exceptions
 
 class MaxRetryError(RequestError):
     "Raised when the maximum number of retries is exceeded."
 
@@ skipping 11 matching lines @@
 
 class HostChangedError(RequestError):
     "Raised when an existing pool gets a request for a foreign host."
 
     def __init__(self, pool, url, retries=3):
         message = "Tried to open a foreign host with url: %s" % url
         RequestError.__init__(self, pool, url, message)
         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
+
+
 class EmptyPoolError(PoolError):
     "Raised when a pool runs out of connections and no more are allowed."
     pass
 
 
 class ClosedPoolError(PoolError):
     "Raised when a request enters a pool after the pool has been closed."
     pass
 
 
 class LocationParseError(ValueError, HTTPError):
     "Raised when get_host or similar fails to parse the URL input."
 
     def __init__(self, location):
         message = "Failed to parse: %s" % location
         HTTPError.__init__(self, message)
 
         self.location = location