Removed static format mappings replacing with a spring extension lookup

Also shuffled some test data around into format specific directories.
added GeoJSON import support, fixes #14
upgraded to geoserver 2.4
major importer overhaul, collapsed task/item into single entity
making gs main normally scopped dependency
removing test dependency on directory iteration order
removing direct access to list
Refactored importer into core, rest, bdb, and web modules.

Also changed package namespace to org.geoserver in preparation for pushing
code into geoserver core.
updating web modules dependencies and changing more org.opengeo package references
added clustering module
added metrics module
changing parent version to 2.3-SNAPSHOT
some tweaks to cluster module, added a configuration and some optmization for message handling / event publishing
reorganized metrics into multiple moduls
removed beans moved to common odule
added some meterics
renameing metrics-core to metrics-base to avoid naming conflict with yammer metrics library
added assembly for cluster module, updated from metrics-core to metrics-base
Integrating cluster module with jdbcconfig:

- broke out config changes into specific events
- added a second more granular synchronizer
updated pom versions to 2.4-SNAPSHOT