Add emsdk_env.bat to create a mechanism of how to set up all environment variables required for a setup, not just PATH.

emsdk.bat

@@ -2,12 +2,13 @@
 
 :: Find python from an explicit location relative to the Emscripten SDK.
 IF EXIST "%~dp0python\2.7.5.1_32bit\python.exe" (
-  "%~dp0python\2.7.5.1_32bit\python" "%~dp0\emsdk" %*
+  call "%~dp0python\2.7.5.1_32bit\python" "%~dp0\emsdk" %*
   GOTO end
 )
 
 :: As last resort, access from PATH.
-python "%~dp0\emsdk" %*
+call python "%~dp0\emsdk" %*
 GOTO end
 
 :end
+@echo on