Reversing if/else condition.
Refactoring code.

- Listing, adding and removing servers using new ServerManager class.
Removing server(s) from ~/.ssh/known_hosts upon removal.
Stripping instead of chomping.
Detecting server architecture and distribution automatically.
Updating README.md
Refactoring code; Removing unnecessary methods.
Ensuring key/values are converted to strings.
Updating Changelog.md