Use the version of CocoaPods-Core.

Gemfile

 source "http://rubygems.org"
 
+BUNDLER_LOAD = true
 gemspec
 
 group :development do
-  # gem "cocoapods-core", :git => "git://github.com/CocoaPods/Core.git"
-  gem "cocoapods-core", :path => "../Core"
+  gem "cocoapods-core", :git => "git://github.com/CocoaPods/Core.git"
   gem "xcodeproj", :git => "git://github.com/CocoaPods/Xcodeproj.git"
   gem "mocha", "~> 0.11.4"
   gem "bacon"

Gemfile.lock

+GIT
+  remote: git://github.com/CocoaPods/Core.git
+  revision: 7d81fe67e641634c26d19b25c424058d6b7c5526
+  specs:
+    cocoapods-core (0.17.0.alpha)
+      activesupport (~> 3.2.6)
+      faraday (~> 0.8.1)
+      octokit (~> 1.7)
+
 GIT
   remote: git://github.com/CocoaPods/Xcodeproj.git
   revision: fbb5c11844b99bd954b2945098502dde0641c311
@@ -18,7 +27,7 @@ GIT
 PATH
   remote: .
   specs:
-    cocoapods (0.17.0.alpha)
+    cocoapods (0.0.0)
       activesupport (~> 3.2.6)
       claide (~> 0.1)
       cocoapods-core
@@ -31,14 +40,6 @@ PATH
       rake (~> 0.9.4)
       xcodeproj (~> 0.4.0)
 
-PATH
-  remote: ../Core
-  specs:
-    cocoapods-core (0.16.0.rc2)
-      activesupport (~> 3.2.6)
-      faraday (~> 0.8.1)
-      octokit (~> 1.7)
-
 GEM
   remote: http://rubygems.org/
   specs:

cocoapods.gemspec

 # -*- encoding: utf-8 -*-
 $:.unshift File.expand_path('../lib', __FILE__)
-require 'cocoapods/version'
 
 Gem::Specification.new do |s|
+
+  # Use the version of CocoaPods-Core
+  if BUNDLER_LOAD = true
+    s.version = '0.0.0'
+  else
+    require 'cocoapods-core'
+    s.version  = Pod::VERSION
+  end
+
   s.name     = "cocoapods"
-  s.version  = Pod::VERSION
   s.date     = Date.today
   s.license  = "MIT"
   s.email    = ["eloy.de.enige@gmail.com", "fabiopelosin@gmail.com"]

lib/cocoapods/version.rb

-module Pod
-  VERSION = '0.17.0.alpha'
-end