Upgrade plugins to latest version.
Upgrade plugins to latest version.

maven-compiler-plugin .................................... 3.2 -> 3.3
maven-enforcer-plugin .................................. 1.3.1 -> 1.4
maven-gpg-plugin ......................................... 1.5 -> 1.6
maven-jar-plugin ......................................... 2.5 -> 2.6
maven-javadoc-plugin ............................... 2.10.1 -> 2.10.3
maven-project-info-reports-plugin ........................ 2.7 -> 2.8
maven-release-plugin ................................. 2.5.1 -> 2.5.2
org.codehaus.mojo:animal-sniffer-maven-plugin .......... 1.13 -> 1.14

UnimibSoftEngCourse1516/lab2-es3-f.spinardi,remus32/junit,kcooney/junit,dvberkel/junit,UnimibSoftEngCourse1516/lab2-es3-f.cirelli1,elijah513/junit,VikingDen/junit,UnimibSoftEngCourse1516/lab2-es3-o.sertori,alb-i986/junit,UnimibSoftEngCourse1516/lab2-es3-s.ravetta,hansjoachim/junit,janocat/junit,moinuddin14/junit,jhfjhfj1/junit,UnimibSoftEngCourse1516/lab2-es3-m.scarpone,easyMan-zzy/junit,avandeursen/junit,openhardnudd/junit,songfj/junit,UnimibSoftEngCourse1516/lab2-es3-f.giannini3,flomotlik/junit,Thothius/junit,UnimibSoftEngCourse1516/lab2-es3-a.mosini,hhariri/junit,UnimibSoftEngCourse1516/lab2-es3-s.ravetta,eamonnmcmanus/junit,ashleyfrieze/junit,ashleyfrieze/junit,mnk/junit,JoaquinSiabra/junit,UnimibSoftEngCourse1516/lab2-es3-f.cirelli1,MichaelJY91/junit,edwardmlyte/junit,mekwin87/junit4,onesfreedom/junit,UnimibSoftEngCourse1516/lab2-es3-s.ravetta,kobe73er/MyUnit,MichaelJY91/junit,UnimibSoftEngCourse1516/lab2-es3-f.giannini3,AxelMonroyX/junit4,UnimibSoftEngCourse1516/lab2-es3-l.salvestrini,paulduffin/junit,songfj/junit,janocat/junit,UnimibSoftEngCourse1516/lab2-es3-s.renzo,moinuddin14/junit,ashleyfrieze/junit,UnimibSoftEngCourse1516/lab2-es3-l.salvestrini,kobe73er/dUnit,kobe73er/dUnit,UnimibSoftEngCourse1516/lab2-es3-f.spinardi,UnimibSoftEngCourse1516/lab2-es3-s.renzo,UnimibSoftEngCourse1516/lab2-es3-m.vella6,kobe73er/dUnit,jordancheah/junit,moinuddin14/junit,UnimibSoftEngCourse1516/lab2-es3-i.pigazzini,powazny/junit4,UnimibSoftEngCourse1516/lab2-es3-a.mosini,junit-team/junit,yusuke/junit,MichaelJY91/junit,sposam/junit,hhariri/junit,laercioferracini/junit,onesfreedom/junit,junit-team/junit,eamonnmcmanus/junit,powazny/junit4,paulduffin/junit,y-kt/junit,mnk/junit,UnimibSoftEngCourse1516/lab2-es3-a.tundo,jhfjhfj1/junit,UnimibSoftEngCourse1516/lab2-es3-a.tundo,Siddartha07/junit,quentin9696/junit,y-kt/junit,flomotlik/junit,flomotlik/junit,avandeursen/junit,laercioferracini/junit,junit-team/junit,powazny/junit4,0359xiaodong/junit,smayoorans/junit,slezier/junit,UnimibSoftEngCourse1516/lab2-es3-m.polonioli,mekwin87/junit4,schauder/junit,remus32/junit,AxelMonroyX/junit4,alohageck0/junit,UnimibSoftEngCourse1516/lab2-es3-e.nani1,freezhan/junit,mnk/junit,elijah513/junit,AxelMonroyX/junit4,eamonnmcmanus/junit,alb-i986/junit,jhfjhfj1/junit,UnimibSoftEngCourse1516/lab2-es3-l.salvestrini,smayoorans/junit,freezhan/junit,slezier/junit,quentin9696/junit,easyMan-zzy/junit,chrisvest/junit,stefanbirkner/junit,rwarren14/junit,Siddartha07/junit,adko-pl/junit,jordancheah/junit,chrisvest/junit,openhardnudd/junit,mekwin87/junit4,UnimibSoftEngCourse1516/lab2-es3-m.scarpone,stefanbirkner/junit,easyMan-zzy/junit,janocat/junit,UnimibSoftEngCourse1516/lab2-es3-m.scarpone,jordancheah/junit,Thothius/junit,adko-pl/junit,hansjoachim/junit,adko-pl/junit,kobe73er/MyUnit,stefanbirkner/junit,dvberkel/junit,feisuo/junit,kcooney/junit,sposam/junit,panchenko/junit,schauder/junit,openhardnudd/junit,hansjoachim/junit,alohageck0/junit,0359xiaodong/junit,paulduffin/junit,UnimibSoftEngCourse1516/lab2-es3-m.polonioli,0359xiaodong/junit,UnimibSoftEngCourse1516/lab2-es3-o.sertori,alohageck0/junit,UnimibSoftEngCourse1516/lab2-es3-a.mosini,songfj/junit,junit-team/junit4,panchenko/junit,dvberkel/junit,Thothius/junit,yusuke/junit,JoaquinSiabra/junit,feisuo/junit,kcooney/junit,edwardmlyte/junit,quentin9696/junit,VikingDen/junit,chrisvest/junit,UnimibSoftEngCourse1516/lab2-es3-m.vella6,feisuo/junit,junit-team/junit4,VikingDen/junit,rwarren14/junit,UnimibSoftEngCourse1516/lab2-es3-a.tundo,onesfreedom/junit,junit-team/junit4,UnimibSoftEngCourse1516/lab2-es3-i.pigazzini,UnimibSoftEngCourse1516/lab2-es3-e.nani1,rwarren14/junit,hhariri/junit,freezhan/junit,laercioferracini/junit,UnimibSoftEngCourse1516/lab2-es3-f.spinardi,alb-i986/junit,slezier/junit,yusuke/junit,panchenko/junit,avandeursen/junit,smayoorans/junit,UnimibSoftEngCourse1516/lab2-es3-e.nani1,Siddartha07/junit,mekwin87/junit4,UnimibSoftEngCourse1516/lab2-es3-m.polonioli,UnimibSoftEngCourse1516/lab2-es3-s.renzo,elijah513/junit,JoaquinSiabra/junit,UnimibSoftEngCourse1516/lab2-es3-m.vella6,kobe73er/MyUnit,edwardmlyte/junit,schauder/junit,y-kt/junit,UnimibSoftEngCourse1516/lab2-es3-i.pigazzini,remus32/junit,UnimibSoftEngCourse1516/lab2-es3-f.giannini3,UnimibSoftEngCourse1516/lab2-es3-f.cirelli1,UnimibSoftEngCourse1516/lab2-es3-o.sertori,sposam/junit