[chef] chef-vault cookbook v1.2.0

[Joshua Timberman < >]

Ohai Chefs!

I've released version 1.2.0 of the chef-vault cookbook. This version incorporates a change to have the `chef_vault_item` method in a module rather than added to the Chef::Recipe class, making it easier to use in other libraries.

It also includes a couple minor fixes to the provider, listed below.

v1.2.0 (2015-02-04)

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- COOK-4672: Make the library helper into a module instead of adding into Chef::Recipe

- Prevent variable masking

- Fix inverted existence check for `current_resource`