Provide a hook to decorate or override
the way that Facelets loads template files. A default implementation
must be provided that satisfies the requirements for loading
templates as in Pre-JSF 2.0 Facelets.
If a <context-param> with the param name equal
to the value of FACELETS_RESOURCE_RESOLVER_PARAM_NAME
exists, the runtime must interpret its value as a fully qualified
classname of a java class that extends ResourceResolver
and has a zero argument public constructor or a one argument public
constructor where the type of the argument is
ResourceResolver. If this param is set and its value
does not conform to those requirements, the runtime must log a
message and continue. If it does conform to these requirements and
has a one-argument constructor, the default
ResourceResolver must be passed to the constructor. If
it has a zero argument constructor it is invoked directly. In either
case, the new ResourceResolver replaces the old
one.