[Gemfile] Depend on Core from '1-0-stable'

Gemfile

@@ -22,7 +22,7 @@ gem 'json', :git => 'https://github.com/segiddins/json.git', :branch => 'seg-1.7
 
 group :development do
   cp_gem 'claide',                'CLAide'
-  cp_gem 'cocoapods-core',        'Core'
+  cp_gem 'cocoapods-core',        'Core',                  '1-0-stable'
   cp_gem 'cocoapods-deintegrate', 'cocoapods-deintegrate'
   cp_gem 'cocoapods-downloader',  'cocoapods-downloader'
   cp_gem 'cocoapods-plugins',     'cocoapods-plugins'

Gemfile.lock

@@ -7,8 +7,8 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Core.git
-  revision: 4398d6f71991e849d5c11f95f6035de5d3cfe812
-  branch: master
+  revision: 603bb3c15bf4ee08584305e3a45776daf40b95db
+  branch: 1-0-stable
   specs:
     cocoapods-core (1.0.0)
       activesupport (>= 4.0.2)
@@ -263,4 +263,4 @@ DEPENDENCIES
   xcodeproj!
 
 BUNDLED WITH
-   1.12.1
+   1.12.5