Created bazel level option to control prefix duplication in tar creat…

…ion.

The `rules_pkg` mainline has the behaviour where it doesn't allow prefix duplication where a subfolder name mimics the top level directory name. Since sometimes this directory structure is desired, a bazel level option was added to control the behaviour.

## Features
- Added the `allow_prefix_duplication` flag to tar creation to allow calls to pkg_tar in bazel to control the desired directory structure. This flag defaults to false to mimic the mainline behaviour.

Merge Pull Request #2.

1.1.0 Point One Patch 1

Updated version number for 0.2.5-p1.4 release.

Updated version number for 0.2.5-p1.3 release.

Updated version number for 0.2.5-p1.2 release.

Updated version number for 0.2.5-p1.1 release.

update verstion to 0.2.5 for a new release (bazelbuild#141)

Bump version for new release

bump version for new release (bazelbuild#91)

Merge pull request bazelbuild#79 from aiuto/feddep

Remove deps on abseil.