drop support for rails 3.2, add appraisal for testing

.gitignore

@@ -1,2 +1,3 @@
 Gemfile.lock
+gemfiles/*.gemfile.lock
 spec/support/log/**/*.log

.travis.yml

@@ -7,3 +7,8 @@ services:
 before_install:
   - gem update --system
   - gem update bundler
+gemfile:
+  - gemfiles/rails_4.0.gemfile
+  - gemfiles/rails_4.1.gemfile
+  - gemfiles/rails_4.2.gemfile
+  - gemfiles/rails_5.0.gemfile

Appraisals

@@ -0,0 +1,15 @@
+appraise 'rails_4.0' do
+  gem 'rails', '~> 4.0.0'
+end
+
+appraise 'rails_4.1' do
+  gem 'rails', '~> 4.1.0'
+end
+
+appraise 'rails_4.2' do
+  gem 'rails', '~> 4.2.0'
+end
+
+appraise 'rails_5.0' do
+  gem 'rails', '~> 5.0.0'
+end

Guardfile

@@ -62,7 +62,7 @@ module ::Guard
   end
 end
 
-guard 'rspec', cmd: 'bundle exec rspec' do
+guard 'rspec', cmd: 'bundle exec appraisal rspec' do
   callback ServicesGemHelpers::OnStart.new, :start_begin
   callback ServicesGemHelpers::OnStop.new,  :stop_begin
 

README.md

@@ -21,7 +21,7 @@ For disambiguation: in this README, when you read "Services" with a uppercase "S
 
 #### Ruby >= 2.2.3
 
-#### Rails >= 3.2
+#### Rails >= 4.0
 
 #### Redis >= 2.8
 

gemfiles/rails_4.0.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "~> 4.0.0"
+
+gemspec :path => "../"

gemfiles/rails_4.1.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "~> 4.1.0"
+
+gemspec :path => "../"

gemfiles/rails_4.2.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "~> 4.2.0"
+
+gemspec :path => "../"

gemfiles/rails_5.0.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", "~> 5.0.0"
+
+gemspec :path => "../"

services.gemspec

@@ -29,6 +29,7 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'tries',       '~> 0.3'
   gem.add_development_dependency 'timecop',     '~> 0.7'
   gem.add_development_dependency 'sqlite3',     '~> 1.3'
-  gem.add_runtime_dependency     'rails',       '>= 3.2.0'
+  gem.add_development_dependency 'appraisal',   '~> 2.1'
+  gem.add_runtime_dependency     'rails',       '>= 4.0.0'
   gem.add_runtime_dependency     'gem_config',  '~> 0.3'
 end