[CHANGELOG] Update for 0.27

CHANGELOG.md

@@ -2,10 +2,19 @@
 
 To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides/installing_cocoapods.html).
 
-## Master
+## 0.27.0
+[CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.26.2...0.27.0)
+• [cocoapods-core](https://github.com/CocoaPods/Core/compare/0.26.2...0.27.0)
+• [Xcodeproj](https://github.com/CocoaPods/Xcodeproj/compare/0.13.0...0.14.0)
 
 ###### Enhancements
 
+* The xcodeproj gem now comes bundled with prebuilt binaries for the Ruby
+  versions that come with OS X 10.8 and 10.9. Users now no longer need to
+  install the Xcode Command Line Tools or deal with the Ruby C header location.
+  [Eloy Durán](https://github.com/alloy)
+  [Xcodeproj#88](https://github.com/CocoaPods/Xcodeproj/issues/88)
+
 * Targets passed to the `link_with` method of the Podfile DSL no longer need
   to be explicitly passed as an array. `link_with ['target1', 'target2']` can
   now be written as `link_with 'target1', 'target2'`.