Further Travis CI tweaks:

  Use sudo: false to enable the new container infrastructure via Travis CI
  Replace 'ruby-head' with '2.1.0' as ruby-head has dependency issues with Travis CI
  Enable bundler caching
  Exclude ruby 2.1.0 and puppet < 3.5.0 in the matrix

.travis.yml

@@ -1,10 +1,12 @@
+sudo: false
+cache: bundler
 language: ruby
 bundler_args: --without development
 script: "bundle exec rake spec"
 rvm:
   - 1.9.3
   - 2.0.0
-  - ruby-head
+  - 2.1.0
 env:
   - PUPPET_GEM_VERSION="~> 3.0.0"
   - PUPPET_GEM_VERSION="~> 3.1.0"
@@ -18,17 +20,28 @@ env:
   - PUPPET_GEM_VERSION="~> 4.0.0" STRICT_VARIABLES=yes
   - PUPPET_GEM_VERSION="~> 4.1.0" STRICT_VARIABLES=yes
   - PUPPET_GEM_VERSION="~> 4.2.0" STRICT_VARIABLES=yes
+  - PUPPET_GEM_VERSION="~> 4.3.0" STRICT_VARIABLES=yes
 matrix:
   allow_failures:
-    - env:
-      - PUPPET_GEM_VERSION="~> 3.7.0" STRICT_VARIABLES=yes FUTURE_PARSER=yes
-      - PUPPET_GEM_VERSION="~> 4.0.0" STRICT_VARIABLES=yes
-      - PUPPET_GEM_VERSION="~> 4.1.0" STRICT_VARIABLES=yes
-      - PUPPET_GEM_VERSION="~> 4.2.0" STRICT_VARIABLES=yes
+    - env: PUPPET_GEM_VERSION="~> 3.7.0" STRICT_VARIABLES=yes FUTURE_PARSER=yes
+    - env: PUPPET_GEM_VERSION="~> 4.0.0" STRICT_VARIABLES=yes
+    - env: PUPPET_GEM_VERSION="~> 4.1.0" STRICT_VARIABLES=yes
+    - env: PUPPET_GEM_VERSION="~> 4.2.0" STRICT_VARIABLES=yes
+    - env: PUPPET_GEM_VERSION="~> 4.3.0" STRICT_VARIABLES=yes
   exclude:
     - rvm: 2.0.0
       env: PUPPET_GEM_VERSION="~> 3.1.0"
     - rvm: 2.0.0
       env: PUPPET_GEM_VERSION="~> 3.0.0"
+    - rvm: 2.1.0
+      env: PUPPET_GEM_VERSION="~> 3.0.0"
+    - rvm: 2.1.0
+      env: PUPPET_GEM_VERSION="~> 3.1.0"
+    - rvm: 2.1.0
+      env: PUPPET_GEM_VERSION="~> 3.2.0"
+    - rvm: 2.1.0
+      env: PUPPET_GEM_VERSION="~> 3.3.0"
+    - rvm: 2.1.0
+      env: PUPPET_GEM_VERSION="~> 3.4.0"
 notifications:
   email: false