Prepare for rubygems: move config/ to lib/gistore

Put all necessary files under lib/gistore, in order to deploy gistore
using rubygems.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
To make install easily, relase as rubygems

Also bump version to 1.0.0-rc4.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
Add PERL_PATH to fix command not find issue

Should not remove PERL_PATH defination in test-lib.sh.

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>