Add --only or --glob option to commit, update etc. to only capture some files

[Arne Bachmann]

Add --only or --glob option to commit, update etc. to only capture some files

[Arne Bachmann]

Each --only would add to the consideredFiles (patterns) list, and --except would require an additional logic to exclude stuff.

[Arne Bachmann]

Almost finished. Any better naming for --except?