[Xcodeproj] Improve support for user build configurations

Closes #1462

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 To install or update CocoaPods see this [guide](http://docs.cocoapods.org/guides/installing_cocoapods.html).
 
+## Master
+
+###### Bug Fixes
+
+* Fixed a crash related to CocoaPods being unable to resolve an unique build
+  setting of an user target with custom build configurations.
+  [Fabio Pelosin](https://github.com/irrationalfab)
+  [#1462](https://github.com/CocoaPods/CocoaPods/issues/1462)
+  [#1463](https://github.com/CocoaPods/CocoaPods/issues/1463)
+  [#1457](https://github.com/CocoaPods/CocoaPods/issues/1457)
+
+
 ## 0.26.2
 [CocoaPods](https://github.com/CocoaPods/CocoaPods/compare/0.26.1...0.26.2)
 • [cocoapods-core](https://github.com/CocoaPods/Core/compare/0.26.1...0.26.2)

Gemfile.lock

@@ -17,10 +17,10 @@ GIT
 
 GIT
   remote: https://github.com/CocoaPods/Xcodeproj.git
-  revision: 970f4a4ac2f75b6887ef4564b3e3f3e55040f496
+  revision: 8459cc35d512f061f6741a82ab708ec93df3fae3
   branch: master
   specs:
-    xcodeproj (0.13.0)
+    xcodeproj (0.13.1)
       activesupport (~> 3.0)
       colored (~> 1.2)
 
@@ -59,7 +59,7 @@ PATH
       escape (~> 0.0.4)
       json (~> 1.8)
       open4 (~> 1.3)
-      xcodeproj (~> 0.13.0)
+      xcodeproj (~> 0.13.1)
 
 GEM
   remote: http://rubygems.org/

cocoapods.gemspec

@@ -30,7 +30,7 @@ s.files = Dir["lib/**/*.rb"] + %w{ bin/pod bin/sandbox-pod README.md LICENSE CHA
   s.add_runtime_dependency 'cocoapods-core',       "= #{Pod::VERSION}"
   s.add_runtime_dependency 'claide',               '~> 0.3.2'
   s.add_runtime_dependency 'cocoapods-downloader', '~> 0.2.0'
-  s.add_runtime_dependency 'xcodeproj',            '~> 0.13.0'
+s.add_runtime_dependency 'xcodeproj',            '~> 0.13.1'
 
   s.add_runtime_dependency 'colored',       '~> 1.2'
   s.add_runtime_dependency 'escape',        '~> 0.0.4'

cocoapods-integration-specs @ ecb44178

-Subproject commit 77e3d95e130ecffcf0f42ebf71b6b1060c1786f9
+Subproject commit ecb441780888f49aa769bc93edade2e9683ecacf

spec/integration.rb

@@ -347,6 +347,10 @@ describe "Integration" do
       check "install --no-repo-update", "install_custom_workspace"
     end
 
+    describe "Integrates a target with custom build settings" do
+      check "install --no-repo-update", "install_custom_build_configuration"
+    end
+
     # @todo add tests for all the hooks API
     #
     describe "Runs the Podfile callbacks" do