Move mail gem dep to Action Mailer's gemspec

Gemfile

@@ -9,9 +9,6 @@ end
 # AS
 gem "i18n", ">= 0.3.0"
 
-# AM
-gem "mail", ">= 1.4.2"
-
 # AR
 gem "arel", "0.2.pre", :git => "git://github.com/rails/arel.git"
 gem "sqlite3-ruby", ">= 1.2.5"

actionmailer/actionmailer.gemspec

@@ -11,7 +11,7 @@
   s.homepage = "http://www.rubyonrails.org"
 
   s.add_dependency('actionpack', '= 3.0.pre')
-  s.add_dependency('mail', '~> 1.3.0')
+  s.add_dependency('mail', '~> 1.4.2')
 
   s.files = Dir['CHANGELOG', 'README', 'MIT-LICENSE', 'lib/**/*']
   s.has_rdoc = true