Enable coveralls.io integration

This also rearranges matrix entries so that the coveralls job is started
first to reduce overall latency.

.travis.yml

@@ -1,15 +1,17 @@
 language: ruby
 cache: bundler
+bundler_args: --without development
 
 rvm:
+  - 2.1
   - 1.8.7
   - 1.9.3
   - 2.0.0
-  - 2.1
 
 sudo: false
 
 env:
+  - PUPPET_VERSION=4.1 COVERAGE=yes
   - PUPPET_VERSION=2.7
   - PUPPET_VERSION=3.2
   - PUPPET_VERSION=3.4
@@ -36,6 +38,15 @@ matrix:
       env: PUPPET_VERSION=2.7
     - rvm: 2.1
       env: PUPPET_VERSION=3.2
+    # run Coveralls exactly once
+    - rvm: 1.8.7
+      env: PUPPET_VERSION=4.1 COVERAGE=yes
+    - rvm: 1.9.3
+      env: PUPPET_VERSION=4.1 COVERAGE=yes
+    - rvm: 2.0.0
+      env: PUPPET_VERSION=4.1 COVERAGE=yes
+    - rvm: 2.1
+      env: PUPPET_VERSION=4.1
 
 notifications:
   email:

Gemfile

@@ -9,4 +9,9 @@ gem 'rake'
 gem 'rspec', rspecversion
 gem 'rspec-core', rspecversion
 gem 'puppet', puppetversion
-gem 'pry', :group => :development
+
+gem 'pry', :group => :development
+
+if ENV['COVERAGE'] == 'yes'
+  gem 'coveralls', :require => false
+end

spec/spec_helper.rb

@@ -1,3 +1,8 @@
+if ENV['COVERAGE'] == 'yes'
+  require 'coveralls'
+  Coveralls.wear!
+end
+
 require 'rspec-puppet'
 
 RSpec.configure do |c|