Adds support for single files in the backup list

Adds more information in README.md

Bugfix: working directory included in backup.

Fixes issues found by 'shellcheck' analyzer.

Adds a success message to be printed at the end of backup.

Renames script to 'easybackup'

Adds -v option to show details about backup progress.

Refactors some functions to have a single rsync command spawned.

Adds options for performing backup on a remote host through SSH.

Allows user to provide a list of patterns to be excluded from backup.

Fixes an issue in README

Improves help() and README

Allows user to provide a list of patterns to be excluded from backup.

Fixes README name in test/

Adds a script for basic testing of easy-backup.