Set version to 0.7.2
Set version to 0.7.2

Change-Id: I51989138c7ac9cd26e2b84710ac8702bcaa654bc

OpenChemistry/avogadroapp,OpenChemistry/avogadroapp,ghutchis/avogadroapp,ghutchis/avogadroapp,wadejong/avogadroapp,OpenChemistry/avogadroapp,wadejong/avogadroapp,ghutchis/avogadroapp,wadejong/avogadroapp,OpenChemistry/avogadroapp,ghutchis/avogadroapp