Added parsing support for methods and properties in protocol.

Updated protocol parsing to support @optional and @required.

Patch by Muhammad Hussein Nasrollahpour <iapplechocolate@me.com>


git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Languages@10227 7b3f36aa-e6db-49c1-8b4c-66eac1997e64