Move test scripts into scripts directory (#485)

I'm planning on adding a some scripts for managing node and python
binaries and I don't want to clutter up the top level any more.

scripts/test.bat

@@ -0,0 +1,7 @@
+:: equivilent of test.sh as windows bat file
+set PATH=%PATH%;%PYTHON_BIN%
+@CALL emsdk install latest
+@CALL emsdk activate latest
+@CALL emsdk_env.bat --build=Release
+@CALL python -c "import sys; print(sys.executable)"
+@CALL emcc.bat -v