Update .travis.yml defaults and remove gem deps

This commit makes the following changes to the test matrix:

- Remove Pupept 2.7 as a default environment
- Runs tests on ruby 2.1.5 instead of 2.0.0
- Runs tests on ruby 1.8.7 with puppet 3.x
- Adds an environment to run on an intermediate 3.x puppet version
  instead of latest (specifically 3.4.x)
- Adds an environment to run with the future parser on latest puppet.
  This would affect the test runs for the validate and spec checks.
- Runs the tests on docker

We also drop some default gem dependencies since puppetlabs_spec_helper
takes care of this for us.

Author: Colleen Murphy

config_defaults.yml

@@ -2,24 +2,26 @@
 .travis.yml:
   script: "\"bundle exec rake validate && bundle exec rake lint && bundle exec rake spec SPEC_OPTS='--format documentation'\""
   includes:
+  - rvm: 1.9.3
+    env: PUPPET_GEM_VERSION="~> 3.4.0"
   - rvm: 1.8.7
-    env: PUPPET_GEM_VERSION="~> 2.7.0" FACTER_GEM_VERSION="~> 1.6.0"
-  - rvm: 1.8.7
-    env: PUPPET_GEM_VERSION="~> 2.7.0" FACTER_GEM_VERSION="~> 1.7.0"
+    env: PUPPET_GEM_VERSION="~> 3.0"
   - rvm: 1.9.3
     env: PUPPET_GEM_VERSION="~> 3.0"
-  - rvm: 2.0.0
+  - rvm: 1.9.3
+    env: PUPPET_GEM_VERSION="~> 3.0" FUTURE_PARSER="yes"
+  - rvm: 2.1.5
     env: PUPPET_GEM_VERSION="~> 3.0"
+  - rvm: 2.1.5
+    env: PUPPET_GEM_VERSION="~> 3.4.0"
+  - rvm: 2.1.5
+    env: PUPPET_GEM_VERSION="~> 3.0" FUTURE_PARSER="yes"
 Gemfile:
   required:
     ':development, :unit_tests':
-      - gem: rake
       - gem: rspec-core
         version: '3.1.7'
-      - gem: rspec-puppet
-        version: '~> 1.0'
       - gem: puppetlabs_spec_helper
-      - gem: puppet-lint
       - gem: simplecov
       - gem: puppet_facts
       - gem: json