Implement lockfile overwrite option for Install service
Add basic `update` command to rebuild policyfile.lock.json
Extract UI object tests to shared example group
Merge branch 'simple-update-cmd'
Add Chefspec support to cookbook generator

- Deleted files/converge_spec.rb from generator cookbook
- Updated files/spec_helper.rb in generator cookbook
- Added templates/recipe_spec.rb.erb to generator cookbook
- Updated cookbook_spec.rb to check for Chefspec files in generated cookbooks
- Updated cookbook.rb in generator to create Chefspec skeleton files
Add Chefspec support to recipe generator

- Update recipe generator to create Chefspec files
- Updated recipe_spec.rb to ensure that Chefspec files are created
Add Chefspec to app generator

- Updated app.rb to generate Chefspec files
- Updated app_spec.rb to test existence & content of Chefspec files
Remove redundant default_recipe.rb.erb template

Replaced references to templates/default_recipe.rb.erb with references to templates/recipe.rb.erb in the following generators:
- app.rb
- recipe.rb
- cookbook.rb

Deleted templates/default_recipe.rb.erb