Update changelogs for C++ maps

Added release notes for Ruby and JavaScript.

Bridge vs2008 hashmaps.

python changes

Beta 3

Initial draft for changelog.

Update version numbers for beta3

Fix the command line interface unittest again

This time move the macro inside namespaces; hopefully will work with the
integration script.

Fix protoc build artifact script.

pbconfig.h has gone. This commit removes the target.

Declare an init and avoid passing NULL to initWithValue:count:

Fixes https://github.com/google/protobuf/issues/1189

Build cleanup

Remove accidentally restored deleted files.

Fix the std::string error introduced in integration.

updated README

Updated README.md

- Fixes up `make distclean` and `make maintainer-clean`
- Fixes the build so make is more likely to notice if one of those files is stale/missing.

Added relative link to cmake guide.

Allow custom type URL prefixes in Any.Pack

Fix bug with silent message corruption in LITE_RUNTIME.

Properly generating well known proto files for the macos build.