Centralize algorithm imports

Algorithm.Python/CustomChartingAlgorithm.py

@@ -1,4 +1,4 @@
-# QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
+# QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
 # Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -11,17 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from clr import AddReference
-AddReference("System")
-AddReference("QuantConnect.Algorithm")
-AddReference("QuantConnect.Common")
-
-from System import *
-from QuantConnect import *
-from QuantConnect.Algorithm import *
-
-import numpy as np
-from datetime import timedelta, datetime
+from AlgorithmImports import *
 
 ### <summary>
 ### Algorithm demonstrating custom charting support in QuantConnect.
@@ -86,4 +76,4 @@ class CustomChartingAlgorithm(QCAlgorithm):
 
     def OnEndOfDay(self, symbol):
        #Log the end of day prices:
-       self.Plot("Trade Plot", "Price", self.lastPrice)
+       self.Plot("Trade Plot", "Price", self.lastPrice)