Ruby Rewrite

[murjax]

Rewrite the original Ruby project (currently in this repo under old/ruby).

Improvements made:

• Remove redundant uptime check ping. If we don't get a response, we just won't do anything.
• Remove git library dependency. We just run git clone directly. This project no longer requires any dependencies outside of testing.
• Validate username presence, account presence, and repo info presence before cloning.
• Stub externals in test. This includes the API request to Github and git clone command. Supported by RSpec method stubbing.
• Create an executable binary.
• Arrange files in standard directories (bin, lib).

Issues for Ruby: #22, #27, #44

[murjax]

@MichaelDimmitt Can you re-review for these two questions?

1. Does this satisfy the specification from issue #44 minus stretch?
2. Is this readable? It's consolidated into a single class right now. There's places to split responsibility into more classes if we want. Will you be able to read it 6 months from now as as?