Do not prompt me when running `lvresize`.

Noticed that `lvresize` prompts you before executing its command:

``Do you really want to remove active logical volume lv_home? [y/n]:``

This change adds ``-f`` to force the command to run non-interactively.
Merge pull request #17 from omaciel/lvresize-prompt

Do not prompt me when running `lvresize`.