Merge pull request #2138 from rsfutch77/protobuf_update

Fix Protobuf Install Instructions

.gitignore

 *.pytest_cache/
 
 # Ignore compiled protobuf files.
-ml-agents-protobuf/cs
-ml-agents-protobuf/python
-ml-agents-protobuf/Grpc*
+*Grpc.Tools*
 
 # Ignore PyPi build files.
 dist/

docs/Creating-Custom-Protobuf-Messages.md

 
 ## Implementing a Custom Message
 
-Assume the ml-agents repository is checked out to a folder named $MLAGENTS_ROOT. Whenever you change the fields of a custom message, you must run `$MLAGENTS_ROOT/protobuf-definitions/make.bat` to create C# and Python files corresponding to the new message. Follow the directions in [this file](../protobuf-definitions/README.md) for guidance. After running `$MLAGENTS_ROOT/protobuf-definitions/make.bat`, reinstall the Python package by running `pip install $MLAGENTS_ROOT/ml-agents` and make sure your Unity project is using the newly-generated version of `$MLAGENTS_ROOT/UnitySDK`.
+Whenever you change the fields of a custom message, you must follow the directions in [this file](../protobuf-definitions/README.md) to create C# and Python files corresponding to the new message and re-install the mlagents Python package.
 
 ## Custom Message Types
 

protobuf-definitions/README.md

 
 ## Requirements
 
-* grpc 1.14.1
+* grpcio-tools 1.11.1
+* Grpc.Tools 1.14.1
+First we will follow these steps once install protobuf and grpcio-tools via your terminal.
+Assume the ml-agents repository is checked out to a folder named $MLAGENTS_ROOT.
+**Note:** If you're using Anaconda, don't forget to activate the ml-agents environment first.
+
-`pip install grpcio-tools`
+`pip install grpcio-tools==1.11.1`
-`nuget install Grpc.Tools` into known directory.
+If you don't have it already, download the latest version of [nuget](https://www.nuget.org/downloads).
+Navigate to your installation of nuget and run the following: 
+
+`nuget install Grpc.Tools -Version 1.14.1 -OutputDirectory $MLAGENTS_ROOT\protobuf-definitions`
-
-On Windows & Linux: [See here](https://github.com/google/protobuf/blob/master/src/README.md).
-1. Install pre-requisites.
-2. Un-comment line 4 in `make.bat`, and set to correct Grpc.Tools sub-directory.
-3. Run `make.bat`
-4. In the generated `UnityToExternalGrpc.cs` file in the `UnitySDK/Assets/ML-Agents/Scripts/CommunicatorObjects` folder, you will need to add the following to the beginning of the file
+Whenever you change the fields of a custom message, you must follow the steps below to create C# and Python files corresponding to the new message.
+
+1. Open a terminal. **Note:** If you're using Anaconda, don't forget to activate the ml-agents environment first.
+2. Un-comment line 7 in `make.bat` (for Windows, use `make_for_win.bat`), and set to correct Grpc.Tools sub-directory.
+3. Run the `.bat` from the terminal by navigating to `$MLAGENTS_ROOT\protobuf-definitions` and entering `make.bat` (for Windows, use `make_for_win.bat`)
+4. Note any errors generated that may result from setting the wrong directory in step 2.
+5. In the generated `UnityToExternalGrpc.cs` file in the `$MLAGENTS_ROOT/UnitySDK/Assets/ML-Agents/Scripts/CommunicatorObjects` folder, you will need to add the following to the beginning of the file:
 
 ```csharp
 # if UNITY_EDITOR || UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX || UNITY_STANDALONE_LINUX
  ```
 This is to make sure the generated code does not try to access the Grpc library
 on platforms that are not supported by Grpc.
+
+Finally, re-install the mlagents packages by running the following commands from the same `$MLAGENTS_ROOT\protobuf-definitions` directory.
+
+```
+cd ..
+cd ml-agents-envs
+pip install -e .
+cd ..
+cd ml-agents
+pip install -e .
+mlagents-learn
+```
+
+The final line will test if everything was generated and installed correctly. If it worked, you should see the Unity logo. 

protobuf-definitions/make_for_win.bat

 rem GRPC-TOOLS required. Install with `nuget install Grpc.Tools`. 
 rem Then un-comment and replace [DIRECTORY] with location of files.
 rem For example, on Windows, you might have something like:
-rem set COMPILER=Grpc.Tools.1.14.1/tools/windows_x64
+rem set COMPILER=Grpc.Tools.1.14.1\tools\windows_x64
+rem set COMPILER=[DIRECTORY]
 
 set SRC_DIR=proto\mlagents\envs\communicator_objects
 set DST_DIR_C=..\UnitySDK\Assets\ML-Agents\Scripts\CommunicatorObjects
 rem generate proto objects in python and C#
 
 for %%i in (%SRC_DIR%\*.proto) do (
-    protoc --proto_path=proto --csharp_out=%DST_DIR_C% %%i
-    protoc --proto_path=proto --python_out=%DST_DIR_P% %%i
+    %COMPILER%\protoc --proto_path=proto --csharp_out=%DST_DIR_C% %%i
+    %COMPILER%\protoc --proto_path=proto --python_out=%DST_DIR_P% %%i
 )
 
 rem grpc
 %COMPILER%\protoc --proto_path=proto --csharp_out %DST_DIR_C% --grpc_out %DST_DIR_C% %SRC_DIR%\%GRPC% --plugin=protoc-gen-grpc=%COMPILER%\grpc_csharp_plugin.exe
-python3 -m grpc_tools.protoc --proto_path=proto --python_out=%DST_DIR_P% --grpc_python_out=%DST_DIR_P% %SRC_DIR%\%GRPC%
+python -m grpc_tools.protoc --proto_path=proto --python_out=%DST_DIR_P% --grpc_python_out=%DST_DIR_P% %SRC_DIR%\%GRPC%
 
 rem Generate the init file for the python module
 rem rm -f $DST_DIR_P/$PYTHON_PACKAGE/__init__.py