Minor improvements to InteractiveShell and FileTailer

What's Changed

• Created initial benchmarks by @JacobCallahan in #4
• Improved benchmarks by @JacobCallahan in #5
• Introduce initial project code standards by @JacobCallahan in #6
• Better handling for exit in pty shells by @JacobCallahan in #7
• Changed FileTailer.tailed_contents to FileTailer.contents by @JacobCallahan in #8

Full Changelog: 0.1.3...0.1.4