message: Fixed README.md giving an invalid Windows command
  The `./` and file separator in the executable path prevented the program from running. The other changes are just cleanup for conformity. This is the last of the Windows doc changes as far as I can tell.
diff: @@ -414,7 +414,7 @@ following CMake command:
  You should then be able to build by invoking Ninja:
  ```
  -ninja
  +> ninja
  ```
  #### Development tips
  @@ -429,7 +429,7 @@ ninja
  To confirm Filament was properly built, run the following command from the build directory:
  ```
  -./samples/material_sandbox --ibl=../../samples/envs/pillars ../../assets/models/sphere/sphere.obj
  +> samples\material_sandbox.exe --ibl=..\..\samples\envs\pillars ..\..\assets\models\sphere\sphere.obj
  ```
  ### Android
  