- Add an Xcode 6.3 created default iOS Project.
- Add an Xcode 6.3 created default OS X Project.
- Add Podfiles to for both that use Protobufs from within the tree.
- Add a script to run the tests (and cleanup) to help confirm the state of the
  Protobuf.podspec and sources.

- Add the folder CocoaPods will add to the root folder.
- Move and expand the entries in the objectivec directory.

Export class Arena to shared library.

Fix #include in js_generator.cc

Merge beta-3 release branch again.

Integrate interanl changes

JSON format for Any message must print @type first

Fix protoc artifact pom version

This got broken in commit 6ef984af
which integrated changes from internal branch.

The commit 3b3c8abb has replaced the <>
with "" in #include statement in js_generator.cc

Added download_url to be able to upload to pypi.

Merge Beta 3 release branch into master

Update changes for lite

Remove the comments about iterator validation

As it may be implementation dependent.

Update changelogs for C++ maps

Test redundant varint fields decoding in JS.

Remove the instructions for pbconfig.h

Added release notes for Ruby and JavaScript.

Fine-tune build scripts and better documentation.

Bridge vs2008 hashmaps.

Add compatibility notice for Java.

python changes

Varints are generally encoded in minimum possible length but need to
ensure that any redundancy does not break fields decoder.

Move test for standalone BoolValue to JsonParserTest

"make google/protobuf/stubs/pbconfig.h" was added in hope of addressing
the issue that when you "make protoc" from a freshly checked out
project, pbconfig.h will be reported missing. However, the trick doesn't
seem to work. Instead, add instructions in the document to work the issue
around.

Also document why MSYS2 cannot be used for publishing protoc.

Beta 3

Initial draft for changelog.