[Config] Added update_notification attribute.

Closes #448

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 [CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.14.0...master)
 
+###### Enhancements
+- Added config option to disable the new version available message.
+  [#448](https://github.com/CocoaPods/CocoaPods/issues/448)
+
 ###### Bug fixes
 - In certain conditions pod setup would execute twice.
 - The git cache now is updated if a branch is not found

lib/cocoapods/command/repo.rb

@@ -142,7 +142,7 @@ module Pod
           "\n[!] The `#{dir.basename.to_s}' repo requires CocoaPods #{version_msg}\n".red +
           "Update Cocoapods, or checkout the appropriate tag in the repo.\n\n"
         end
-        puts "\nCocoapods #{versions['last']} is available.\n".green if has_update(versions)
+        puts "\nCocoapods #{versions['last']} is available.\n".green if has_update(versions) && config.new_version_message?
       end
 
       def self.compatible?(name)

lib/cocoapods/config.rb

@@ -14,7 +14,7 @@ module Pod
     attr_accessor :clean, :verbose, :silent
     attr_accessor :generate_docs, :doc_install
     attr_accessor :integrate_targets
-    attr_accessor :git_cache_size
+    attr_accessor :new_version_message
 
     alias_method :clean?,             :clean
     alias_method :verbose?,           :verbose
@@ -22,11 +22,12 @@ module Pod
     alias_method :generate_docs?,     :generate_docs
     alias_method :doc_install?,       :doc_install
     alias_method :integrate_targets?, :integrate_targets
+    alias_method :new_version_message?, :new_version_message
 
     def initialize
       @repos_dir = Pathname.new(File.expand_path("~/.cocoapods"))
       @verbose = @silent = false
-      @clean = @generate_docs = @doc_install = @integrate_targets = true
+      @clean = @generate_docs = @doc_install = @integrate_targets = @new_version_message = true
     end
 
     def project_root