Merge github.com:grpc/grpc into ssl

src/python/README.md

@@ -46,7 +46,7 @@ Installing
 
 - Install gRPC Python's dependencies
 ```
-$ pip install enum34==1.0.4 futures==2.2.0 protobuf==3.0.0-alpha-1
+$ pip install -r requirements.txt
 ```
 
 - Install gRPC Python

src/python/requirements.txt

@@ -0,0 +1,3 @@
+enum34==1.0.4
+futures==2.2.0
+protobuf==3.0.0-alpha-1