filter_objects: files is already a set
filter_objects: remove printing that doesn't belong in internal functions
pull: fix --all to avoid limiting by patterns in current tree

Regression introduced in:

  commit c23422388b975f13867457c86c78361dfdf8036e
  Author: Tomas Herman <tomas.herman@wikidi.com>
  Date:   Tue Apr 23 11:59:38 2013 +0200

      Added support for pulling only a subset of files.

Reported-by: Nikola Kovacs <nikola.kovacs@gmail.com>
Merge branch 'jed/pull-all'

Fixes #23

* jed/pull-all:
  pull: fix --all to avoid limiting by patterns in current tree
  filter_objects: remove printing that doesn't belong in internal functions
  filter_objects: files is already a set