Upgrades Ruby to 2.3 and Rails to 4.2

.ruby-version

@@ -0,0 +1 @@
+2.3.1

.travis.yml

@@ -4,7 +4,7 @@ before_install:
 - sudo apt-get install -qq libclamav6 libclamav-dev clamav
 - gem install bundler
 rvm:
-- 2.1.5
+- 2.3.1
 before_script:
 - cp config/log4r.yml.sample config/log4r.yml
 - git clone https://github.com/duke-libraries/ddr-portals.git

Gemfile

@@ -1,11 +1,12 @@
 source 'https://rubygems.org'
+ruby '2.3.1'
 
-gem 'rails', '~> 4.1.13'
-gem 'blacklight', '5.16'
+gem 'rails', '4.2.7'
+gem 'blacklight', '~> 5.16'
 gem 'hydra-head', '~> 7.2.0'
-gem 'ddr-alerts', '~> 1.0.0'
+gem 'ddr-alerts', git: 'https://github.com/duke-libraries/ddr-alerts', ref: '01408a82f13292b655b3c561688cf824cbd14549'
 gem 'devise' # must be explicitly required
-gem 'ddr-models', '2.5.0'
+gem 'ddr-models', git: 'https://github.com/duke-libraries/ddr-models', ref: 'e0ed623a3722ca9583f2531f97dd5f20c126293d'
 
 gem 'log4r'
 gem 'bootstrap-sass', '~> 3.3.4'
@@ -29,6 +30,11 @@ gem 'nokogiri'
 gem 'edtf-humanize', '~> 0.0.7'
 gem 'rails_autolink'
 
+# Rails 4.2+
+gem 'responders', '~> 2.0'
+gem 'web-console', '~> 2.0', group: :development
+gem 'sprockets-rails', '>= 2.1.4'
+
 gem 'sdoc', '~> 0.4.0', group: :doc
 
 group :development do