Fixed Unused Parameter warning in headers.

Change references to `vector` to use `std::vector`

There is an example at the top of the page which contains code that appears to show a user how to create and serialize a message to a file. However the flags to open the file lack the O_CREAT flag which allows creating the file if it doesn't exist. I was troubleshooting a situation where this snippet was used and compiled, but never created a file.

Upstreaming patch used by Chromium in
https://codereview.chromium.org/693773003/

Includes files generated by each of:
   * autogen.sh
   * configure
   * make

Release objects allocated by InitializeDefaultRepeatedFields()

Fix "warning C4018: '<' : signed/unsigned mismatch" 

Fix a bug that causes DynamicMessage.setField() to not work for repeated enum fields.

Fix descriptor validation logic for packed enum fields.

Explicitly specify pyext/cpp_message.py in py_modules list

enum fields.

Replace links to code.google.com/protobuf with developers.google.com/protocol-buffers

Add support for solaris atomicops

Add check for sched_yield in librt

This patch adds support for atomic operations on Solaris, on any platform.
It makes use of the atomic functions made available in Solaris' atomic.h
header.

In Solaris, sched_yield lives in librt, rather than libc. This patch adds a
check which will link in librt if necessary.