Make podspecs work for nested dirs

src/objective-c/generated_libraries/RemoteTestClient/RemoteTest.podspec

@@ -7,16 +7,18 @@ Pod::Spec.new do |s|
   s.osx.deployment_target = "10.8"
 
   # Run protoc with the Objective-C and gRPC plugins to generate protocol messages and gRPC clients.
-  s.prepare_command = "protoc --objc_out=. --objcgrpc_out=. *.proto"
+  s.prepare_command = "protoc --objc_out=. --objcgrpc_out=. *.proto **/*.proto"
 
   s.subspec "Messages" do |ms|
-    ms.source_files = "*.pbobjc.{h,m}"
+    ms.source_files = "*.pbobjc.{h,m}", "**/*.pbobjc.{h,m}"
+    ms.header_mappings_dir = "."
     ms.requires_arc = false
     ms.dependency "Protobuf", "~> 3.0.0-alpha-3"
   end
 
   s.subspec "Services" do |ss|
-    ss.source_files = "*.pbrpc.{h,m}"
+    ss.source_files = "*.pbrpc.{h,m}", "**/*.pbrpc.{h,m}"
+    ss.header_mappings_dir = "."
     ss.requires_arc = true
     ss.dependency "gRPC", "~> 0.5"
     ss.dependency "#{s.name}/Messages"

src/objective-c/generated_libraries/RouteGuideClient/RouteGuide.podspec

@@ -7,16 +7,18 @@ Pod::Spec.new do |s|
   s.osx.deployment_target = "10.8"
 
   # Run protoc with the Objective-C and gRPC plugins to generate protocol messages and gRPC clients.
-  s.prepare_command = "protoc --objc_out=. --objcgrpc_out=. *.proto"
+  s.prepare_command = "protoc --objc_out=. --objcgrpc_out=. *.proto **/*.proto"
 
   s.subspec "Messages" do |ms|
-    ms.source_files = "*.pbobjc.{h,m}"
+    ms.source_files = "*.pbobjc.{h,m}", "**/*.pbobjc.{h,m}"
+    ms.header_mappings_dir = "."
     ms.requires_arc = false
     ms.dependency "Protobuf", "~> 3.0.0-alpha-3"
   end
 
   s.subspec "Services" do |ss|
-    ss.source_files = "*.pbrpc.{h,m}"
+    ss.source_files = "*.pbrpc.{h,m}", "**/*.pbrpc.{h,m}"
+    ss.header_mappings_dir = "."
     ss.requires_arc = true
     ss.dependency "gRPC", "~> 0.5"
     ss.dependency "#{s.name}/Messages"