[Xcodeproj] Don't promote warnings to errors

CHANGELOG.md

@@ -8,6 +8,11 @@ To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides
 
 ##### Enhancements
 
+* Warnings are not promoted to errors anymore to maximise compatibility with
+  existing libraries.  
+  [Fabio Pelosin](https://github.com/irrationalfab)
+  [#1629](https://github.com/CocoaPods/CocoaPods/issues/1629)
+
 * Include the versions of the Pods to the output of `pod list`.  
   [Stefan Damm](https://github.com/StefanDamm)
   [Robert Zuber](https://github.com/z00b)

Gemfile.lock

@@ -18,7 +18,7 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
-  revision: 4cc95f412d47fe8b31c5619c6705070b7849663f
+  revision: 74cca1c36ab235caa70969b68d0d883237f75493
   branch: master
   specs:
     xcodeproj (0.15.3)

cocoapods-integration-specs @ f309d24d

-Subproject commit 27a44d7c15b58e8fa431ae774f13d348ad315721
+Subproject commit f309d24da2bf8dbd7a81dfaee621eae5121ce921