Added a logback to the examples so that they produce some logging output instead of an error
Added a logback to the examples so that they produce some logging output instead of an error

bigplus/crawljax,ntatsumi/crawljax,saltlab/crawljax-graphdb,cschroed-usgs/crawljax,robertzas/crawljax,cschroed-usgs/crawljax,xujun10110/crawljax,crawljax/crawljax,fivejjs/crawljax,cschroed-usgs/crawljax,ntatsumi/crawljax,xujun10110/crawljax,adini121/crawljax,robertzas/crawljax,aminmf/crawljax,adini121/crawljax,ntatsumi/crawljax,cschroed-usgs/crawljax,robertzas/crawljax,aminmf/crawljax,fivejjs/crawljax,aminmf/crawljax,saltlab/crawljax-graphdb,robertzas/crawljax,xujun10110/crawljax,bigplus/crawljax,crawljax/crawljax,aminmf/crawljax,xujun10110/crawljax,crawljax/crawljax,bigplus/crawljax,adini121/crawljax,fivejjs/crawljax,ntatsumi/crawljax,adini121/crawljax,fivejjs/crawljax,crawljax/crawljax,bigplus/crawljax