Add Ruby 2.3.0 to Travis build matrix

To get things working, also:

  * Add `rake` development dependency
  * Bump `childprocess` gem dependency
  * Fix Gemfile-related integration test on Travis

Author: dirk

.travis.yml

@@ -9,6 +9,7 @@ rvm:
   - 2.0
   - 2.1
   - 2.2
+  - 2.3.0
   - jruby-19mode
   - rbx-2
 

overcommit.gemspec

@@ -26,9 +26,10 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 1.9.3'
 
-  s.add_dependency             'childprocess', '~> 0.5.6'
+  s.add_dependency             'childprocess', '~> 0.5.8'
   s.add_dependency             'iniparse', '~> 1.4'
 
+  s.add_development_dependency 'rake', '~> 10.4'
   s.add_development_dependency 'rspec', '~> 3.0'
   s.add_development_dependency 'travis', '~> 1.7'
 end

spec/integration/gemfile_option_spec.rb

@@ -7,6 +7,8 @@
   # We point the overcommit gem back to this repo since we can't assume the gem
   # has already been installed in a test environment
   let(:gemfile) { normalize_indent(<<-RUBY) }
+    source 'https://rubygems.org'
+
     gem 'overcommit', path: '#{repo_root}'
     gem 'my_fake_gem', path: '#{fake_gem_path}'
   RUBY