add info dir to Info-directory-list

--HG--
rename : _info/rdebug-emacs.info => info/rdebug-emacs.info
rename : _info/rdebug-emacs.texi => info/rdebug-emacs.texi
rename : _info/rinari.info => info/rinari.info
rename : _info/rinari.texi => info/rinari.texi
rename : _info/ruby-debug.info => info/ruby-debug.info
rename : _info/ruby-debug.texi => info/ruby-debug.texi
add package geben