Remove apt-get update

The puppetlabs-apt module handles apt-get update for you, you don't need
it here.
ensure => installed is implicit in puppet

you wouldn't mention the package unless you wanted it to be installed
probably ought to ensure package is installed after its apt::source
fix typo in README
lint settings
update for latest versions of dependencies in travis
Merge branch 'philandstuff-master'
fix quoting of non-variable strings