ZF-11662: Additional request methods

Description

The HTTP methods PATCH, LINK and UNLINK should be added to the Zend_Http_Client_Adapter_Curl write() method, as specified in http://tools.ietf.org/html/rfc2068#section-19.6.1.

Comments

Also, I would suggest to separate the http-method verification (just below the "// ensure correct curl call" comment) in a different method, like validate() or something, in such a way I can extend the component in a new class and overwrite the method.

Is there any progress for this ticket?

If not, I'd like to adapt the changes that have been made in ZF2 for that issue:

https://github.com/zendframework/zf2/pull/1877 https://github.com/zendframework/zf2/pull/1856

And extend the LINK and UNLINK methods.