Rename ASTVisitor for clarity
Some beginning experiments with groovy
Fix for config scope
Added beginnings of a configurationbuilder (with a mediocre API at the moment)
Added sample groovy configuration builder API
Refactored configuration system to support a new WindupConfigurationLoader abstraction. This allows extensions to provide their own WindupConfigurationLoader. Currently there are two of these, JavaWindupConfigurationProviderLoader and GroovyWindupConfigurationProviderLoader.