There were few advices regarding the current state
of ExtensibleMetadaProvider. The most important
was to:

- split into two interfaces. One with
getCacheDir() and second with all the other
methods minus supportsXXX() one as it will no
longer be needed

- second suggestion was to rename it, however the
suggested name Configuration was refused and no
other was suggestion made. It is however not clear
why something like this should be called provider.


Other minor suggestions include
- in javadoc link to AntProjectHelper as the way
how to create the interface
- consider it being interface. Should it be
interface? Maybe public final would be better