Set version to 0.6-SNAPSHOT
Add default logback.xml config file to be picked up by commands run outside a repository.
Set maven plugins version numbers.

This avoids the maven warning logs at build time complaining about
lack of version information in maven plugin declarations.
declare all depdendencies in the root pom.

All dependencies that were defined in module specific poms are now defined
in the dependencyManagement section of the root pom, and all dependency
versions are set as properties in the root pom's properties section.

This allows for an easier tracking of dependencies and versions.
Upgrade jcommander, jline, and mockito dependency numbers to their respective latests.
redirect java.util.logging loggers to slf4j even if not in a geogit directory
first attempt at a geogit map command.

The geogit map command displays a map of the indicated layer (e.g. geogit map roads).
Run it from inside geogit-console so the JMapFrame gets to show up, otherwise the
System.exit() call in geogit makes the program exit before.