Fix for Debian based distros

Check to see if /etc/lsb-release exists to avoid:
cat: can't open '/etc/lsb-release': No such file or directory
cat: can't open '/etc/lsb-release': No such file or directory
cat: can't open '/etc/lsb-release': No such file or directory
Merge pull request #13 from jmealo/patch-1

Fix for Debian based distros