test future parser and re-enable puppet 4 testing

Author: pall-valmundsson

.travis.yml

@@ -3,3 +3,9 @@ rvm:
   - 1.9.3
   - 2.0.0
 script: "bundle exec rake test"
+env:
+  matrix:
+    - PUPPET_GEM_VERSION="~> 3.7.0"
+    - PUPPET_GEM_VERSION="~> 3.7.0" FUTURE_PARSER="yes" STRICT_VARIABLES="no"
+    - PUPPET_GEM_VERSION="~> 3.7.0" FUTURE_PARSER="yes" STRICT_VARIABLES="yes"
+    - PUPPET_GEM_VERSION="~> 4.0.0"

Gemfile

@@ -1,7 +1,11 @@
 # A sample Gemfile
 source "https://rubygems.org"
 
-gem 'puppet', '< 4.0.0'
+if puppetversion = ENV['PUPPET_GEM_VERSION']
+      gem 'puppet', puppetversion
+else
+      gem 'puppet', '< 4.0.0'
+end
 
 gem 'rake'
 gem 'rspec'