Discussions regarding svn commit: r655573, r655574 -> summary for the record

just for the record:

jukka, marcel and myself discussed the 2 threads yesterday
in basel and reached consensus as follows:

- keep a namespace caching in jcr2spi but replace the
   NamespaceCache by a simple map, that gets cleared
   if necessary.
- make jcr2spi and core use the same NamespaceRegistry
   with different storage impls.
- reintroduce the NamespaceStorage
- we didn't decide in which project the latter is going
   to live. spi-commons was one possibility discussed.
- jukka volunteered to provide a patch to have something
   concrete to look at.

regards
angela