[Gemfile] Return to Core master branch

Gemfile

@@ -12,7 +12,7 @@ gemspec
 
 group :development do
   cp_gem 'claide',               'CLAide'
-  cp_gem 'cocoapods-core',       'Core', 'source-url'
+  cp_gem 'cocoapods-core',       'Core'
   cp_gem 'cocoapods-downloader', 'cocoapods-downloader'
   cp_gem 'cocoapods-plugins',    'cocoapods-plugins'
   cp_gem 'cocoapods-trunk',      'cocoapods-trunk'

Gemfile.lock

@@ -7,8 +7,8 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Core.git
-  revision: 64d5b311a7ee1dd6e0ad8716a1bd5033436d04d8
-  branch: source-url
+  revision: b9dcb24367e8215637cdee840af58a9f0bf62568
+  branch: master
   specs:
     cocoapods-core (0.34.0.rc2)
       activesupport (>= 3.2.15)