update&improve docs; improve scripts; fix wrong URLs and bugs

Author: brillliantz

data_api.py

@@ -350,8 +350,8 @@ def query(self, view, filter="", fields="", data_format="", **kwargs ) :
         
         Examples
         --------
-        res3, msg3 = ds.query("lb.secDailyIndicator", fields="price_level,high_52w_adj,low_52w_adj",
-                              filter="start_date=20170907&end_date=20170907",                             
+        res3, msg3 = ds.query("lb.secDailyIndicator", fields="price_level,high_52w_adj,low_52w_adj",\
+                              filter="start_date=20170907&end_date=20170907",\
                               data_format='pandas')
             view does not change. fileds can be any field predefined in reference data api.