Refactored cli

The following methods are deprecated: get_fixing_commits_from_closed_issues() and get_fixing_commits_from_commit_message().
They have been replaced by the method get_fixing_commits() that returns the types of fix along with the hash. For examples

{
hash1: ['SYNTAX', 'IDEMPOTENCY']
}

meaning that the commit with hash1 fixes syntax and idempotency issues.