Remove ruby package in preparation for submodule

Signed-off-by: Tammer Saleh <tammer@pivotallabs.com>
Add ruby-package as submodule

Signed-off-by: Tammer Saleh <tammer@pivotallabs.com>
Remove update_sub as it is not safe for non-master tracking submodules

Signed-off-by: Tammer Saleh <tammer@pivotallabs.com>