Update .gitignore

Update .gitignore file, with two fixtures entry.
Split '--input-dir' option in two more self-explained ones

Split '--input-dir' option into '--config-dir' and '--schema-dir'
options, which are more self-explained.
This commit fixes #746
Merge pull request #796 from cristianoc72/issue-746

[Command] Split '--input-dir' option in two more self-explained ones