repo config: add git remote for rismoney

run `bundle exec rake` to add remote to your local repo
repo config: add git remote for jumanjiman

run `bundle exec rake` to update your git remotes
CONTRIBUTING: minor changes

* Provide link to upstream repo for fork
* Provide link to CONTRIBUTING.md
* Show how to run single rspec locally
repo config: add git aliases for maintainer

These aliases affect the local repo, not the user's system or
other personal git configs. These aliases are only effective
while the user is inside this repo, and only after running
`bundle exec rake` to setup local repo config.