(maint) Add some testing and a travis.yml

Prior to this commit there was an appveyor.yml and no other CI files.
This commit adds a .sync.yml for PDK 1.6.0 and configures some basic
tests for the module. The tests include a shellcheck option and enforce
rubocop. There are no spec tests currently defined.

.sync.yml

@@ -0,0 +1,32 @@
+.gitlab-ci.yml:
+  delete: true
+appveyor.yml:
+  delete: true
+
+Rakefile:
+  extras:
+    - |
+       desc 'Syntax check shellscripts'
+       task :shellcheck do
+         Dir['{tasks,files}/**/*.sh'].each do |shell_file|
+           sh "shellcheck #{shell_file}" do |ok, res|
+               exit res.exitstatus unless ok
+           end
+         end
+       end
+
+.travis.yml:
+  branches:
+    - /.*/
+  deploy: false
+  includes:
+    - 
+      env: CHECK="syntax lint metadata_lint check:symlinks check:git_ignore check:dot_underscore check:test_file rubocop shellcheck"
+  remove_includes:
+    -
+      env: CHECK="syntax lint metadata_lint check:symlinks check:git_ignore check:dot_underscore check:test_file rubocop"
+    -
+      env: CHECK=parallel_spec
+    -
+      env: PUPPET_GEM_VERSION="~> 4.0" CHECK=parallel_spec
+      rvm: 2.1.9

.travis.yml

@@ -0,0 +1,31 @@
+---
+sudo: false
+dist: trusty
+language: ruby
+cache: bundler
+before_install:
+  - bundle -v
+  - rm -f Gemfile.lock
+  - gem update --system
+  - gem --version
+  - bundle -v
+script:
+  - 'bundle exec rake $CHECK'
+bundler_args: --without system_tests
+rvm:
+  - 2.4.1
+env:
+  global:
+    - BEAKER_PUPPET_COLLECTION=puppet5 PUPPET_GEM_VERSION="~> 5.0"
+matrix:
+  fast_finish: true
+  include:
+    -
+      env: CHECK="syntax lint metadata_lint check:symlinks check:git_ignore check:dot_underscore check:test_file rubocop shellcheck"
+branches:
+  only:
+    - master
+    - /^v\d/
+    - /.*/
+notifications:
+  email: false

Rakefile

@@ -75,7 +75,7 @@ end
 
 desc 'Syntax check shellscripts'
 task :shellcheck do
-  Dir['**/*.sh'].each do |shell_file|
+  Dir['{tasks,files}/**/*.sh'].each do |shell_file|
     sh "shellcheck #{shell_file}" do |ok, res|
         exit res.exitstatus unless ok
     end