Issue #665 - Use cookbook versions found Berksfile.lock if found.

- Added Berksfile.locl to myface test fixture
- Added berkshelf as a first class dependency
- Added wrapper around Berkshelf::Lockfile
- Have the plugin try to parse its cookbook dependencies from the Berksfile.lock.
- Hide the --cookbooks option and print a deprecation warning.
- Bootstrap checks cookbook_versions in options first then checks for versions in the plugin.
- Upgrade checks cookbook_versions in options first then checks for versions in the plugin.
Merge pull request #675 from RallySoftware-cookbooks/Issue-665

Use cookbook versions found Berksfile.lock if found. (Issue #665)