Add license field to gemspecs, by Matt Griffin

actionmailer/actionmailer.gemspec

@@ -7,6 +7,7 @@ Gem::Specification.new do |s|
   s.summary     = 'Email composition, delivery, and receiving framework (part of Rails).'
   s.description = 'Email on Rails. Compose, deliver, receive, and test emails using the familiar controller/view pattern. First-class support for multipart email and attachments.'
   s.required_ruby_version = '>= 1.9.3'
+  s.license     = 'MIT'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'

actionpack/actionpack.gemspec

@@ -7,6 +7,7 @@ Gem::Specification.new do |s|
   s.summary     = 'Web-flow and rendering framework putting the VC in MVC (part of Rails).'
   s.description = 'Web apps on Rails. Simple, battle-tested conventions for building and testing MVC web applications. Works with any Rack-compatible server.'
   s.required_ruby_version = '>= 1.9.3'
+  s.license     = 'MIT'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'

activemodel/activemodel.gemspec

@@ -8,6 +8,7 @@ Gem::Specification.new do |s|
   s.description = 'A toolkit for building modeling frameworks like Active Record. Rich support for attributes, callbacks, validations, observers, serialization, internationalization, and testing.'
 
   s.required_ruby_version = '>= 1.9.3'
+  s.license     = 'MIT'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'

activerecord/activerecord.gemspec

@@ -8,6 +8,7 @@ Gem::Specification.new do |s|
   s.description = 'Databases on Rails. Build a persistent domain model by mapping database tables to Ruby classes. Strong conventions for associations, validations, aggregations, migrations, and testing come baked-in.'
 
   s.required_ruby_version = '>= 1.9.3'
+  s.license     = 'MIT'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'

activesupport/activesupport.gemspec

@@ -8,6 +8,7 @@ Gem::Specification.new do |s|
   s.description = 'A toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Rich support for multibyte strings, internationalization, time zones, and testing.'
 
   s.required_ruby_version = '>= 1.9.3'
+  s.license     = 'MIT'
 
   s.author       = 'David Heinemeier Hansson'
   s.email        = 'david@loudthinking.com'

rails.gemspec

@@ -9,6 +9,7 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version     = '>= 1.9.3'
   s.required_rubygems_version = ">= 1.8.11"
+  s.license     = 'MIT'
 
   s.author   = 'David Heinemeier Hansson'
   s.email    = 'david@loudthinking.com'

railties/railties.gemspec

@@ -7,6 +7,7 @@ Gem::Specification.new do |s|
   s.summary     = 'Tools for creating, working with, and running Rails applications.'
   s.description = 'Rails internals: application bootup, plugins, generators, and rake tasks.'
   s.required_ruby_version = '>= 1.9.3'
+  s.license     = 'MIT'
 
   s.author            = 'David Heinemeier Hansson'
   s.email             = 'david@loudthinking.com'