Bump CocoaPods version

See CocoaPods/CocoaPods#1273

Gemfile.lock

@@ -1,45 +1,45 @@
 GIT
   remote: git://github.com/CocoaPods/CocoaPods.git
-  revision: b3a3d2d04eaa0b1078504c76a31265ce77871cdf
+  revision: 92aa8a2c45ea178f68307f1ef83fe107fbf59189
   branch: master
   specs:
-    cocoapods (0.25.0)
-      activesupport (~> 3.2)
+    cocoapods (0.27.1)
+      activesupport (>= 3.2.15, < 4)
       claide (~> 0.3.2)
-      cocoapods-core (= 0.25.0)
+      cocoapods-core (= 0.27.1)
       cocoapods-downloader (~> 0.2.0)
       colored (~> 1.2)
       escape (~> 0.0.4)
-      json (~> 1.8)
+      json_pure (~> 1.8)
       open4 (~> 1.3)
-      xcodeproj (~> 0.11.0)
+      xcodeproj (~> 0.14.0)
 
 GIT
   remote: git://github.com/CocoaPods/Xcodeproj.git
-  revision: c1751f473d90f7dd03c0433c88b6178ec2f13080
+  revision: 33d4a70380f1a141dec3a7da727e7c77ed191e0e
   branch: master
   specs:
-    xcodeproj (0.11.1)
+    xcodeproj (0.14.0)
       activesupport (~> 3.0)
       colored (~> 1.2)
 
 GEM
   remote: http://rubygems.org/
   specs:
-    activesupport (3.2.14)
+    activesupport (3.2.15)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
     claide (0.3.2)
-    cocoapods-core (0.25.0)
-      activesupport (~> 3.0)
-      json (~> 1.8)
+    cocoapods-core (0.27.1)
+      activesupport (>= 3.2.15, < 4)
+      json_pure (~> 1.8)
       nap (~> 0.5)
     cocoapods-downloader (0.2.0)
     colored (1.2)
     escape (0.0.4)
     i18n (0.6.5)
-    json (1.8.0)
-    multi_json (1.8.1)
+    json_pure (1.8.1)
+    multi_json (1.8.2)
     nap (0.5.1)
     open4 (1.3.0)
     rake (10.1.0)