Updating LibreOffice package

Hi yoshimov,
I sent you this pull request to update the LibreOffice package to version 4.0.3.
In addition i replaced your icon mix with the official desktop icon. I think the icon mix is too big and detailed for the chocolatey gallery (128 x 128 px) and therefore the icons get very tiny. It’s not necessary to have the letters “LibreOffice” in the icon, it’s alredy in the package name. :-)