cleanup: Make tab with consistent.

This commit changes the width of a indent to be two characters across
the board.  Earlier commits had a mixture of two and four space tabs.
Rakefile: Add maintainer-clean task.
gems: Fully specify ruby environment.
Vagrantfile: Name the virtual machine.
TESTING.md: Explain how to test this cookbook.
Merge pull request #2 from dave-shawley/cleanup-cookbook

Cleanup cookbook