fix typo in comment
open files with O_NOATIME if possible
Merge pull request #113 from c4rlo/noatime

open files with O_NOATIME if possible
Merge pull request #111 from c4rlo/patch-1

fix typo in comment
xattr: Fix issue with empty (0 bytes) xattr values.

Closes #106
Added missing changelog entry
Implement --exclude-if-present

Add a new --exclude-if-present command-line flag to ``attic create``.  If
specified, directories containing the specified tag file will be excluded from
the backup. The flag can be repeated to ignore more than a single tag file,
irregardless of the contents.
Implement --keep-tag-files to preserve directory roots/tag-files

We also add --keep-tag-files to keep in the archive the root directory and the
tag/exclusion file in the archive.