Apparently, in Cocoapods, all recursive #imports of public headers need
to be public.

Add Ruby to Travis testing

- Added RVM-based Ruby test driver that tests MRI and JRuby.
- Fixed JRuby compilation (at least in my current setup): force source
  version to 1.6 (Java 6) to allow generics and annotations.
- Modify the skipped JRuby JSON tests so that the exit code is 0 (skip()
  results in a failing exit code from `rake test`). An upcoming PR
  should fix JSON under JRuby in general soon.

Dockerfile for building protoc on Centos 6.6

Uncomment conflict fields from pkg-config files.

The referenced bug was fixed in 2007 and has been released in pkg-config-0.23
(16.Jan.2008). The fixed version is widely available.

Change-Id: I23dee1c1d27b6440658680e9c273b6250213123c

adding globals() to exec call for python3 compatibility

Handle 0-length byte buffers in micro and nano protobufs

Fix java compilation issues when processing large .proto files

Run conformance tests against Java for the Travis build.

Change-Id: I8ef8664f7facf86028be3f4f0d5d2efc8a685d6d

Objective C compiler plugin and runtime

Cleanup setup.py

- Comply with flake8, except for indentation width, which is 2.

- Move human-centric metadata to top of 'setup()' call.

- Add Trove classifiers for supported Python versions.

- Use 'find_packages()' + MANIFEST.in to avoid errors in listing
  modules and packages.

Closes #131 and #161.

Adds conformance test support for Java.

Change-Id: I845ee1ab1005d25c8d77a8c2ed801c0f7b7c847b

ruby: allow a message field to be unset

ruby: return nil for out of bounds

ruby arrays don't throw an exception; they return nil.  Lets do the
same!

this fix also includes the ability to use negative array indicies

ruby: Add size to RepeatField

starting to make `RepeatedField` quack like an array

additional changes:
* make sure gemspec gets all ruby code files
* add homepage in gem spec removes one of the warnings, and the gem spec authors are pushing
everyone to include a homepage in the gem
* remove excess whitespace in test suite to bring formatting inline with the rest of the file

ruby: build cleanups

* update docs to simplify build steps
* Gemfile.lock seemed to have an older version specified
* do not check in the pkg dir

Generate pbconfig.h in generate_descriptor_proto.sh

Sync nanoproto from AOSP