style(dev): Some PEP8-y fixes

Author: hfaran

piazza_api/network.py

@@ -188,7 +188,6 @@ def get_feed(self, limit=100, offset=0):
         :param limit: Number of posts from feed to get, starting from ``offset``
         :type offset: int
         :param offset: Offset starting from bottom of feed
-        :type sort: str
         :rtype: dict
         :returns: Feed metadata, including list of posts in feed format; this
             means they are not the full posts but only in partial form as

piazza_api/piazza.py

@@ -1,5 +1,4 @@
 from .rpc import PiazzaRPC
-from .exceptions import NotAuthenticatedError
 from .network import Network
 
 

piazza_api/rpc.py

@@ -4,7 +4,7 @@
 import requests
 
 from piazza_api.exceptions import AuthenticationError, NotAuthenticatedError, \
-    RequestError, NoNetworkIDError
+    RequestError
 
 
 class PiazzaRPC(object):