Contributors file.

git-svn-id: http://libphonenumber.googlecode.com/svn@642 ee073f10-1060-11df-b6a4-87a95322a99c
JS/CPP/JAVA: libphonenumber 5.9.1 metadata updates.

git-svn-id: http://libphonenumber.googlecode.com/svn@643 ee073f10-1060-11df-b6a4-87a95322a99c