* Porting functions to the modern Puppet 4.x API

* Port augeas() function to Puppet 4.x API

* Add augeas in .travis.yml and Gemfile

* Fix specs

Co-authored-by: Ben Ford <ben.ford@puppetlabs.com>

* Convert to PDK

* Rubocop

* Fix Lint/ScriptPermission

* Fix Lint/ParenthesesAsGroupedExpression

* Fix RSpec/AnyInstance

* Adjust .travis.yml

* Remove rspec opts files

* Archlinux osfamily support.
Added augeas package for archlinux

* Added Archlinux to metadata.json and verified the spec tests still pass.

Allow Puppet 6 and remove stdlib dependency

By replacing `anchor` with `contain` (which has been available since
puppet 3.4), the dependency on puppetlabs/stdlib can be removed
altogether.

allow puppetlabs/stdlib 5.x;  set puppet version range to >= 4.10.0 < 6.0.0

Use assert_type

Make commands shorter by using cwd

This reverts commit 9a88fbdf.