Fixing name of MLAgentsSDK logfile.

MLAgentsSDK/Assets/ML-Agents/Scripts/Academy.cs

                 var pythonParameters = brainBatcher.SendAcademyParameters(academyParameters);
                 Random.InitState(pythonParameters.Seed);
                 Application.logMessageReceived += HandleLog;
-                logPath = Path.GetFullPath(".") + "/unity-environment.log";
+                logPath = Path.GetFullPath(".") + "/MLAgentsSDK.log";
                 logWriter = new StreamWriter(logPath, false);
                 logWriter.WriteLine(System.DateTime.Now.ToString());
                 logWriter.WriteLine(" ");

mlagents/envs/exception.py

                         "You can check the logfile for more information at {}".format(log_file_path))
             except:
                 logger.error("An error might have occured in the environment. "
-               "No unity-environment.log file could be found.") 
+               "No MLAgentsSDK.log file could be found.") 
         super(UnityTimeOutException, self).__init__(message)