Introduce `backup` plugin to export/import settings
Specify current backup version at the top of the script
Introduce DOKKU_ROOT and import now in git plugin
Merge pull request #265 from asm89/backup

Introduce `backup` plugin to export/import settings
Update headers
Provide more feedback for backup import
Update bootstrap.sh

A typo has been corrected.
Merge pull request #325 from ugurthemaster/patch-1

Update bootstrap.sh
Delete the /cache directory's contents from inside the container.

Fixes #322.
Buildpacks write into /cache as root, which made the delete command unable
to delete it.
Its contents are now deleted using "docker run", and thus as root.
Update HISTORY.md
Merge branch 'history'

* history:
  Update HISTORY.md
Add support for DOKKU_TAG in bootstrap.sh

Fixes #330
Refs #329
Use globs, set nullglob, and remove stdout redirection for import
Merge pull request #333 from rhy-jot/2013-11-20/backup-find-to-glob

backup:export: find -> glob
Add a version command.

The git tag/revision is saved when running "make install", and can be
displayed using "dokku version".
Use a hardcoded version if git revision is not available.
Add the date and time of installation if version is hardcoded.
Merge pull request #334 from plietar/version

Add a version command.
Fix capitalization for consistency
Merge pull request #337 from ryanseys/patch-1

Fix capitalization for consistency