Add, remove, and log

Merge pull request #2 from perryqh/add-remove

Add, remove and log

introducing reset_to_remote to fix push -force

v0.2.0

Merge branch 'circleci-project-setup'

Basic Funcionality

The first release meets its main two objectives:

1. Handle private-keys without changing configs so that multiple threads can use multiple ssh private keys at the same time
2. Do NOT change directories. Another git gem seems to do this, which leads to all kinds of havoc in a multi-threaded environment

The basic functionality is in place, but I really need to add some good documentation!