* Add write helper.
* Adjust modules (except openssl_certificate).
* Adding tests for mode (with openssl_privatekey).
* Add openssl_certificate support.
* Never, ever remove the output file before actually trying to generate new content for it.
Removal is only allowed when state=absent, or when the object has been regenerated and the result needs to be written to that place.
* Add changelog.
* Extend test.
