Update Ruby / Rails / gem dependencies

Resolves #1329
- update Ruby to 2.2.3
- update Rails to 4.2.5
- update remaining gems to latest versions

.ruby-version

@@ -1 +1 @@
-2.1.2
+2.2.3

.travis.yml

@@ -1,7 +1,7 @@
 language: ruby
 
 rvm:
-  - 2.1.2
+  - 2.2.3
 
 env:
   global:

Gemfile

@@ -1,107 +1,107 @@
 source 'https://rubygems.org'
 
-ruby '2.1.2' # Version in .ruby-version must match
+ruby '2.2.3' # Version in .ruby-version must match
 
 # standard gems
-gem 'rails', '~> 4.1.9'
-gem 'mysql2', '~> 0.3.18'
+gem 'rails', '~> 4.2.5'
+gem 'mysql2', '~> 0.4.2'
 gem 'rake', '~> 10.4.2'
 gem 'rdoc', '~> 4.2.0'
 
 # simulate environment variables
 gem 'dotenv-rails', '~> 2.0.2', :require => 'dotenv/rails-now'
 
 # authentication / authorization
-gem 'devise', '~> 3.4.1'
-gem 'devise_cas_authenticatable', '~> 1.3.7' # if ENV['CAS_AUTH']
-gem 'cancancan', '~> 1.10.1'
+gem 'devise', '~> 3.5.2'
+gem 'devise_cas_authenticatable', '~> 1.6.0', require: !!ENV['CAS_AUTH']
+gem 'cancancan', '~> 1.13.1'
 
 # scheduling
 gem 'whenever', '~> 0.9.4'
 
 # administrative panel
-gem 'rails_admin', '~> 0.6.6'
+gem 'rails_admin', '~> 0.8.1'
 
 # ldap integration
-gem 'net-ldap', '~> 0.11'
+gem 'net-ldap', '~> 0.12.1'
 
 # attachments
-gem 'paperclip', '~> 4.2.1'
+gem 'paperclip', '~> 4.3.2'
 
 # soft deletion
-gem 'permanent_records', '~> 3.2.0'
-gem 'nilify_blanks', '~> 1.2.0'
+gem 'permanent_records', '~> 4.1.0'
+gem 'nilify_blanks', '~> 1.2.1'
 
 # ui
-gem 'jquery-rails', '~> 3.1.2'
-gem 'jquery-ui-rails', '~> 5.0.3'
-gem 'jquery-datatables-rails', '~> 3.1.1'
+gem 'jquery-rails', '~> 4.0.5'
+gem 'jquery-ui-rails', '~> 5.0.5'
+gem 'jquery-datatables-rails', '~> 3.3.0'
 gem 'rails4-autocomplete', '~> 1.1.1'
-gem 'select2-rails', '~> 3.5.9.3'
+gem 'select2-rails', '~> 4.0.0'
 gem 'kaminari', '~> 0.16.3'
-gem 'draper', '~> 1.4.0'
-gem 'inline_svg'
+gem 'draper', '~> 2.1.0'
+gem 'inline_svg', '~> 0.6.1'
 
 # forms / formatting
-gem 'simple_form', '~> 3.1.0'
+gem 'simple_form', '~> 3.2.0'
 gem 'cocoon', '~> 1.2.6'
-gem 'redcarpet', '~> 3.2.2'
+gem 'redcarpet', '~> 3.3.3'
 
 group :development, :test do
-  gem 'pry', '~> 0.10.1'
-  gem 'pry-rails', '~> 0.3.3'
-  gem 'pry-byebug', '~> 3.0.1'
+  gem 'pry', '~> 0.10.3'
+  gem 'pry-rails', '~> 0.3.4'
+  gem 'pry-byebug', '~> 3.3.0'
   gem 'pry-stack_explorer', '~> 0.4.9.2'
   gem 'pry-remote', '~> 0.1.8'
-  gem 'letter_opener', '~> 1.3.0'
+  gem 'letter_opener', '~> 1.4.1'
   gem 'letter_opener_web', '~> 1.3.0'
   gem 'factory_girl_rails', '~> 4.5.0'
-  gem 'rspec-rails', '~> 3.2.0'
-  gem 'shoulda-matchers', '~> 2.8.0'
-  gem 'capybara', '~> 2.4.4'
-  gem 'guard-rspec', '~> 4.5.0'
-  gem 'spring', '~> 1.3.2'
+  gem 'rspec-rails', '~> 3.4.0'
+  gem 'shoulda-matchers', '~> 3.0.1'
+  gem 'capybara', '~> 2.5.0'
+  gem 'guard-rspec', '~> 4.6.4'
+  gem 'spring', '~> 1.4.4'
   gem 'spring-commands-rspec', '~> 1.0.4'
   gem 'fuubar', '~> 2.0.0'
-  gem 'guard-livereload', '~> 2.4.0'
+  gem 'guard-livereload', '~> 2.5.1'
   gem 'capistrano', '3.4.0', require: false
   gem 'capistrano-bundler', '~> 1.1.4', require: false
   gem 'capistrano-rails', '~> 1.1.2', require: false
   gem 'capistrano-rvm', '~> 0.1.2', require: false
-  gem 'highline', '~> 1.7.2', require: false
+  gem 'highline', '~> 1.7.8', require: false
   gem 'awesome_print', '~> 1.6.1'
-  gem 'codeclimate-test-reporter', '~> 0.4.6'
-  gem 'database_cleaner', '~> 1.4.0'
-  gem 'rubocop', '~> 0.29.1', require: false
+  gem 'codeclimate-test-reporter', '~> 0.4.8'
+  gem 'database_cleaner', '~> 1.5.1'
+  gem 'rubocop', '~> 0.35.1', require: false
 end
 
 group :development, :test, :heroku do
   # seed script gems
-  gem 'ffaker', '~> 1.32.1', require: false
-  gem 'ruby-progressbar', '~> 1.7.1', require: false
+  gem 'ffaker', '~> 2.1.0', require: false
+  gem 'ruby-progressbar', '~> 1.7.5', require: false
 end
 
 # assets
-gem 'sass-rails', '~> 5.0.1'
+gem 'sass-rails', '~> 5.0.4'
 gem 'coffee-rails', '~> 4.1.0'
-gem 'uglifier', '~> 2.7.0'
-gem 'bootstrap-sass', '~> 3.3.3'
-gem 'font-awesome-rails', '~> 4.4.0'
+gem 'uglifier', '~> 2.7.2'
+gem 'bootstrap-sass', '~> 3.3.6'
+gem 'font-awesome-rails', '~> 4.5.0'
 
 group :development do
-  gem 'thin', '~> 1.6.3'
-  gem 'rack-mini-profiler', '~> 0.9.2'
-  gem 'bullet', '~> 4.14.4'
+  gem 'thin', '~> 1.6.4'
+  gem 'rack-mini-profiler', '~> 0.9.8'
+  gem 'bullet', '~> 4.14.10'
 end
 
 group :production do
-  gem 'therubyracer', '~> 0.12.1', require: 'v8'
+  gem 'therubyracer', '~> 0.12.2', require: 'v8'
   gem 'party_foul', '~> 1.5.5'
 end
 
 group :heroku do
-  gem 'pg', '~> 0.18.1'
-  gem 'unicorn', '~> 4.8.3'
-  gem 'rack-timeout', '~> 0.2.0'
+  gem 'pg', '~> 0.18.4'
+  gem 'unicorn', '~> 5.0.1'
+  gem 'rack-timeout', '~> 0.3.2'
   gem 'rails_12factor', '~> 0.0.3'
 end