restructure to have class for Arduino

Arduino/arduino.py

@@ -103,6 +103,7 @@ def find_port(baud, timeout):
             return sr
     return None
 
+
 def get_version(sr):
     cmd_str = build_cmd_str("version")
     try:
@@ -115,7 +116,6 @@ def get_version(sr):
 
 class Arduino(object):
 
-
     def __init__(self, baud=115200, port=None, timeout=2, sr=None):
         """
         Initializes serial communication with Arduino if no connection is