FLUID-5463: Updating build scripts

The logic to copy over the README, Release-Notes and Infusion-LICENSE has been made a bit more robust to find the files with any file extension. This should prevent omitted files when the file format is changed, but the name remains the same.
Merge remote-tracking branch 'justin/FLUID-5463' into HEAD

* justin/FLUID-5463:
  FLUID-5463: Updating build scripts