[New Pod] ProtobufObjC

From the defacto canonical git repo https://github.com/booyah/protobuf-objc .
The package name is "ProtobufObjC" to differentiate it from plain C protobuf,
but the name in the podspec is "ProtocolBuffers" because that's where the generated
protobuf files expect to find the protobuf headers.

ProtobufObjC/0.1.0/ProtobufObjC.podspec

@@ -0,0 +1,12 @@
+Pod::Spec.new do |s|
+  s.name     = 'ProtocolBuffers'
+  s.version  = '0.1.0'
+  s.license  = 'MIT'
+  s.summary  = 'An implementation of Protocol Buffers in Objective C'
+  s.homepage = 'http://code.google.com/p/metasyntactic/wiki/ProtocolBuffers'
+  s.author   = { 'Cyrus' => 'cyrusn@stwing.upenn.edu' }
+
+  s.source   = { :git => 'https://github.com/booyah/protobuf-objc.git', :commit => '9eb586b2178163c2fdbdfce772a48731e5884905' }
+
+  s.source_files = 'src/runtime/Classes/*.{h,m}'
+end