Allow disabling of BarAPI output via configuration

Was requested to be implemented. Wrote up a simple implementation utilizing the classes already at hand, no major rewriting.

Project.properties was changed by my IDE, I reverted this change with the second commit ( Maven would make this a little less painful :) )

#Added code

New configuration option: `awe.use-barapi`, default: `true`
Does not disable loading BarAPI, simply disables output within `BarAPIntegrator.java`