Fix SSH#wait's logger call to #info

Fixes #175
Remove bundler references from README.
Include definitions directory when uploading the cookbooks.

Closes #157
Merge pull request #178 from ryansouza/fix-ssh-wait-logger

Fix SSH#wait's logger call to #info
Merge pull request #179 from juliandunn/remove-bundler-references

Remove bundler references from README.
Detect all Bundler ENV vars to unset Generator::Init#unbundlerize.

Closes #145
Allow Test Kitchen to be used as a library; CWD is not enough.
Update Busser#test_root to be a private message.
Compute default test_base_path in Config based on kitchen_root.
Pin safe_yaml to 0.9.3 until upstream resolves 0.9.4 perms issue.