Fixed login for issue fbchat-dev#625

Facebook changed response format. ServerJSDefine is no longer in it.

fbchat/_session.py

@@ -16,7 +16,9 @@
 
 
 SERVER_JS_DEFINE_REGEX = re.compile(
-    r'(?:"ServerJS".{,100}\.handle\({.*"define":)|(?:require\("ServerJSDefine"\)\)?\.handleDefines\()'
+    r'(?:"ServerJS".{,100}\.handle\({.*"define":)'
+    r'|(?:ServerJS.{,100}\.handleWithCustomApplyEach\(ScheduledApplyEach,{.*"define":)'
+    r'|(?:require\("ServerJSDefine"\)\)?\.handleDefines\()'
 )
 SERVER_JS_DEFINE_JSON_DECODER = json.JSONDecoder()
 
@@ -411,7 +413,7 @@ def _from_session(cls, session):
 
         # Make a request to the main page to retrieve ServerJSDefine entries
         try:
-            r = session.get(prefix_url("/"), allow_redirects=False)
+            r = session.get(prefix_url("/"), allow_redirects=True)
         except requests.RequestException as e:
             _exception.handle_requests_error(e)
         _exception.handle_http_error(r.status_code)