Fixes #98 - Moved API & MapReduce classes to their own module.

Pull Request for #98

Organized packages in core module.  Created FluoFactory class so users
can create FluoClient or FluoAdmin from API using reflection.  Core now
generates test jar to allow other modules to use utility test classes.
Formatted Maven pom files to use two spaces.  Configuration class was
renamed to Environment.
should link to other props, like LoaderExecutorProperties... or maybe collapse everything needed into a FluoClientProperties object to make the API consistent.