Remove hardcoded version of the SQ Maven plugin
Remove hardcoded version of the SQ Maven plugin

Hardcoding versions of the SQ Maven plugin prevents to analyse the project on future releases of SonarQube. For instance, the analysis of Titan on Nemo (http://nemo.sonarqube.org/dashboard/index?id=com.thinkaurelius.titan%3Atitan) is broken because of this.(cherry picked from commit 3d193fb26fc5a06ffb3fe92599ffc8752d390969)

amcp/titan,graben1437/titan,banjiewen/titan,dylanht/titan,amcp/titan,pluradj/titan,englishtown/titan,CYPP/titan,thinkaurelius/titan,thinkaurelius/titan,elubow/titan,CYPP/titan,mbrukman/titan,thinkaurelius/titan,amcp/titan,pluradj/titan,thinkaurelius/titan,samanalysis/titan,banjiewen/titan,graben1437/titan,samanalysis/titan,elubow/titan,dylanht/titan,mbrukman/titan,dylanht/titan,banjiewen/titan,pluradj/titan,pluradj/titan,samanalysis/titan,samanalysis/titan,mbrukman/titan,amcp/titan,englishtown/titan,elubow/titan,banjiewen/titan,elubow/titan,mbrukman/titan,dylanht/titan,CYPP/titan,CYPP/titan,mbrukman/titan,englishtown/titan,englishtown/titan,graben1437/titan,graben1437/titan