Merge PRs #1423 by @msteiger and #1436 by @flo - library updates

engine/build.gradle

@@ -92,10 +92,10 @@ dependencies {
 
     // Storage and networking
     compile group: 'com.google.guava', name: 'guava', version: '18.0'
-    compile group: 'com.google.code.gson', name: 'gson', version: '2.3'
-    compile group: 'com.google.protobuf', name: 'protobuf-java', version: '2.5.0'
+    compile group: 'com.google.code.gson', name: 'gson', version: '2.3.1'
+    compile group: 'com.google.protobuf', name: 'protobuf-java', version: '2.6.1'
     compile group: 'net.sf.trove4j', name: 'trove4j', version: '3.0.3'
-    compile group: 'io.netty', name: 'netty', version: '3.6.5.Final'
+    compile group: 'io.netty', name: 'netty', version: '3.9.5.Final'
 
     // Java magic
     compile group: 'net.java.dev.jna', name: 'jna', version: '3.5.2'

protobuf/compiler/readme.txt

@@ -1,6 +1,6 @@
 Protocol Buffers - Google's data interchange format
 Copyright 2008 Google Inc.
-http://code.google.com/p/protobuf/
+https://developers.google.com/protocol-buffers/
 
 This package contains a precompiled Win32 binary version of the protocol buffer
 compiler (protoc).  This binary is intended for Windows users who want to
@@ -12,4 +12,4 @@ the C++ compiler used.
 
 You will still need to download the source code package in order to obtain the
 Java or Python runtime libraries.  Get it from:
-  http://code.google.com/p/protobuf/downloads/
+  https://github.com/google/protobuf/releases/