new tool: check_update.sh - has fgci-ansible on github been updated?
new tool: check_update.sh - has fgci-ansible on github been updated?

 - solves #116
 - this could be used to inform users that there have been updates

mantti/fgci-tut,A1ve5/fgci-ansible,mantti/fgci-tut,mantti/fgci-tut,CSC-IT-Center-for-Science/fgci-ansible