Add Ruby 2.2 & 2.3 to Travis config and fix GEM dependencies

.travis.yml

@@ -1,5 +1,7 @@
 language: ruby
 rvm:
+  - 2.3.0
+  - 2.2.0
   - 2.1.0
   - 2.0.0
   - 1.9.3

Gemfile

@@ -12,8 +12,6 @@ group :development do
   gem "guard"
   gem "guard-rspec"
   gem "rb-readline", "~> 0.5.0"
-  gem "jeweler", ">= 1.6.2"
-  gem 'coveralls', require: false
   gem "test_construct"
   gem "capture-output", "~> 1.0.0"
   if RbConfig::CONFIG['host_os'] =~ /linux|freebsd|openbsd|sunos|solaris/
@@ -22,7 +20,25 @@ group :development do
   if RbConfig::CONFIG['host_os'] =~ /darwin|mac os/
     gem 'terminal-notifier-guard', '~> 1.6.1'
   end
-  if RUBY_VERSION >= '1.9.2'
+  if RUBY_VERSION < '2.0.0'
+    gem "addressable", "< 2.5"
+    gem "json", "< 2"
+    gem "coveralls", "< 0.8.6", require: false
+    gem "tins", "< 1.3.5"
+    gem "term-ansicolor", "< 1.3.2"
+    gem "rubocop", "< 0.42"
+  else
+    gem "coveralls", require: false
     gem "rubocop"
   end
+  if RUBY_VERSION < '2.1.0'
+    gem "rdoc", "< 5"
+  end
+  if RUBY_VERSION < '2.3.0'
+    gem "rack", "< 2"
+    gem "listen", "< 3"
+    gem "jeweler", ">= 1.6.2", "< 2.2"
+  else
+    gem "jeweler", ">= 1.6.2"
+  end
 end