Remove version constraints for plugins required to build tools.

Normally it is not a good idea to place <version> constraints in the
definition of plugins in pom.xml unless a specific version really is
needed.

This patch removes the constraints.

There are various benefits to this, one of them is that it will always
build with the latest packaged version of the plugins on a Debian or
Ubuntu system.

Author: daniel@pocock.pro

R=jia.shao.peng@gmail.com
BUG=

Review URL: https://codereview.appspot.com/122480043

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk@682 ee073f10-1060-11df-b6a4-87a95322a99c
Debian package - copyright file.

This updates the debian/copyright file to mention files from Chromium
and other authors.

Author: daniel@pocock.pro

R=jia.shao.peng@gmail.com
BUG=

Review URL: https://codereview.appspot.com/131960043

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk@683 ee073f10-1060-11df-b6a4-87a95322a99c
Debian README.source

This provides a debian/README.source file for people building packages.

Author: daniel@pocock.pro

R=jia.shao.peng@gmail.com
BUG=

Review URL: https://codereview.appspot.com/128450043

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk@684 ee073f10-1060-11df-b6a4-87a95322a99c
JAVA/JS/CPP: Metadata updates v6.2.2

git-svn-id: http://libphonenumber.googlecode.com/svn/trunk@685 ee073f10-1060-11df-b6a4-87a95322a99c