Add jsf-api_2.0_spec

The JSF API dependency used in this project and in jbossas/trunk are:

<dependency>
<groupId>javax.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>2.0.2-FCS</version>
</dependency>

While working on the jboss-javaee6-specs-bom, I was informed about the discussion the EG had of the many different versions used to define the JSF APIs and that the recommended artifactId should be: javax.faces:jsf-api:2.0

As noted in this guide:
http://www.javaserverfaces.org/get-started

The intent of this project is to alleviate confusion of multiply defined naming/versioning of the same APIs and looking for suggestions how to address this for JSF.