Addressing Vince's PR comments.

- Highlighting Python snippet in FAQ.
- Fixing import in Python API doc.
- ml-agents-protbuf now automatically places generated files in
  the correct directory.

docs/FAQ.md

 communication port {} is still in use. "`, you can change the worker number in
 the Python script when calling
 
-`UnityEnvironment(file_name=filename, worker_id=X)`
+```python
+UnityEnvironment(file_name=filename, worker_id=X)
+```
 
 ## Mean reward : nan
 

docs/Python-API.md

 environment is 3DBall.app, in python, run:
 
 ```python
-from unityagents import UnityEnvironment
+from mlagents.env import UnityEnvironment
 env = UnityEnvironment(file_name="3DBall", worker_id=0, seed=1)
 ```
 

ml-agents-protobuf/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. Copy created `communicator_objects` and `CommunicatorObjects` folders to
-   their respective sub-directories within the `ml-agents` repository.
-    * For Python, the generated files should be copied to:
-      `mlagents/envs/communicator_objects`
-    * For C#, the generated files should be copied to:
-      `MLAgentsSDK/Assets/ML-Agents/Scripts/CommunicatorObjects`.

ml-agents-protobuf/make.bat

 # GRPC-TOOLS required. Install with `nuget install Grpc.Tools`. 
 # Then un-comment and replace [DIRECTORY] with location of files.
 # For example, on macOS, you might have something like:
-COMPILER=Grpc.Tools.1.14.1/tools/macosx_x64
+# COMPILER=Grpc.Tools.1.14.1/tools/macosx_x64
-DST_DIR_C=cs/CommunicatorObjects
-DST_DIR_P=python
+DST_DIR_C=../MLAgentsSDK/Assets/ML-Agents/Scripts/CommunicatorObjects
+DST_DIR_P=..
 PROTO_PATH=proto
 
 PYTHON_PACKAGE=mlagents/envs/communicator_objects
-rm -rf $DST_DIR_P
+rm -rf $DST_DIR_P/$PYTHON_PACKAGE
 mkdir -p $DST_DIR_C
 mkdir -p $DST_DIR_P/$PYTHON_PACKAGE