Release 1.2.0

### Summary:
This release adds `puppet://` URI support, a few bugfixes, and lots of tests.

### Features:
- `puppet://` URI support for the `chain`, `certificate`, and `private_key` parameters

### Bugfixes:
- Validate that keystore passwords are > 6 characters (would silent fail before)
- Fixed corrupted keystore PKCS12 files in some cases.
- More acceptance tests, unit tests, and rspec-puppet tests.