Updating the gemspec to use mysql2, activerecord 4.2 and byebug for ruby 2.1

Author: Kyle d'Oliveira

polymorphic_integer_type.gemspec

@@ -21,8 +21,8 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "bundler", "~> 1.2"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rspec"
-  spec.add_development_dependency "activerecord", "3.2.11"
-  spec.add_development_dependency "mysql", "2.8.1"
-  spec.add_development_dependency "debugger"  
+  spec.add_development_dependency "activerecord", "4.2.0"
+  spec.add_development_dependency "mysql2", "0.3.16"
+  spec.add_development_dependency "byebug"
 
 end

spec/support/active_record.rb

@@ -2,7 +2,7 @@
 Dir["#{File.dirname(__FILE__)}/migrations/*.rb"].each {|f| require f}
 
 config = {
-  :adapter => "mysql",
+  :adapter => "mysql2",
   :host => "localhost",
   :database => "polymorphic_integer_type_test",
   :username => "root",