This commit adds a --retry-mins option to enable users to choose how many minutes pass
between attempts to retry a toot deletion when there is an error.
Also re-organises documentation and bumps version to 2.6.
Commit adds a --version flag to display the current version (from setup.py) and also fetch the latest version (from the git repo).
Additionally includes the version number in the header when running deletions.
Resolves#27
Resolves#20 - now uses setuptools for easy installation with pip
Resolves#13 - can now manage multiple accounts
Config file is now in YAML and is passed to script with --config flag
Can now execute from anywhere