Add support for generation sources into a framework.

- Add a protoc objc option (generate_for_named_framework) to set the name of
  the framework all generated sources will be in.
- Tweak some comments/naming to make it clear what is the Protobuf framework
  vs. the framework for generated code.
- Update the objc README to document the new generation option to protoc.

This is working towards https://github.com/google/protobuf/issues/1457.

Also hotwires updating ruby as CocoaPods was crashing within a support library.

Fixes #1619 

proper codeblock in README

protoc: support '=' in --proto_path arguments

CMake prerelease versioning

Build examples in CMake

Make conformance tests more strict about the failure list.

OS X's version of Python has a slightly different error
message for this error case.

A series of improvements:

- Improved Protobuf module compatibility (disabled by default);
- Hide advanced settings;
- Added build tree configuration;
- Added build of examples.

Python 2.x doesn't detect unpaired surrogates so we have to
do that manually.

The failure lists were falling out of date because the
tests would pass even if people forgot to remove failures
from the list.

Add more context to GPBCodedInputStream failures.
Have GPBMessage parsing apis extract out the GPBCodedInputStream information and expose it.
Update HeaderDocs with pointers to all error domains/codes.
Expand the unittests to cover the full set of errors reported.

Fixes https://github.com/google/protobuf/issues/1618

Add https://github.com/os72/protobuf-dynamic

Add reference to Protocol Buffers Dynamic Schema (https://github.com/os72/protobuf-dynamic)

Update the list of places where the version is stored.

Bump cmake minimum required version to 2.8.12

add protobuf as3 lib and code generator for as3

Remove unused lines from CMake files.

Merge beta-3 release branch into master.

Removing unused GPBExceptionMessageKey

1.only support proto3
2.support oneof map
3.support nested message and enum for as3