use logging instead of print

Replaced the print statements with logging statements in the exception.py file
Uses the same logger as the environment one
named the logger unityagents

python/unityagents/environment.py

 from sys import platform
 
 logging.basicConfig(level=logging.INFO)
-logger = logging.getLogger(__name__)
+logger = logging.getLogger("unityagents")
 
 
 class UnityEnvironment(object):

python/unityagents/exception.py

+import logging
+logger = logging.getLogger("unityagents")
+
 class UnityEnvironmentException(Exception):
     """
     Related to errors starting and closing environment.
     def __init__(self, message, log_file_path = None):
         if log_file_path is not None:
             try:
-	            with open(log_file_path, "r") as f:
-	                printing = False
-	                for l in f:
-	                    l=l.strip()
-	                    if (l == 'Exception') or (l=='Error'):
-	                        printing = True
-	                        print('----------------------')
-	                    if (l == ''):
-	                        printing = False
-	                    if printing:
-	                        print(l)
-	                print("An error might have occured in the environment. "
-	                    "You can check the logfile for more information at {}".format(log_file_path))
+                with open(log_file_path, "r") as f:
+                    printing = False
+                    unity_error = '\n'
+                    for l in f:
+                        l=l.strip()
+                        if (l == 'Exception') or (l=='Error'):
+                            printing = True
+                            unity_error += '----------------------\n'
+                        if (l == ''):
+                            printing = False
+                        if printing:
+                            unity_error += l + '\n'
+                    logger.info(unity_error)
+                    logger.error("An error might have occured in the environment. "
+                        "You can check the logfile for more information at {}".format(log_file_path))
-                print("An error might have occured in the environment. "
+                logger.error("An error might have occured in the environment. "
                "No unity-environment.log file could be found.") 
         super(UnityTimeOutException, self).__init__(message)