add tests

[X1011]

write (unit) tests using something like roundup, Bats, assert.sh, or shelltestrunner.

write tests for

• attempting to deploy without setting up first
  • non-existent deploy_directory (check if the deploy directory is empty or not #5)
  • empty deploy_directory (check if the deploy directory is empty or not #5)
  • non-existent remote deploy_branch (check if the deploy directory is empty or not #5)
  • non-existent local deploy_branch
• non-writable remote repo
• setup should not delete existing files in deploy_directory (i think it does currently if a file also exists in the repo's root)
• don't expose repo URL
  • even when an operation fails (fatal error compromises the token #7)

[MoOx]

You just added some right?

[X1011]

Yeah, but so far, I've only written a basic happy-case integration test and some unit tests for the code I'm working on for issue #7, so I can't check anything off of this list yet.

[MoOx]

No problem. That's awesome. Thanks for you work.