Move the javadoc configuration to the default.
Move the javadoc configuration to the default.

* Making the configuration of javadoc tied to the execution makes it harder for
  people to tweak the javadoc configuration as they have to invoke the lifecycle
  rather than just invoke 'mvn javadoc:javadoc' to see the effects quickly

laercioferracini/junit,quentin9696/junit,freezhan/junit,alohageck0/junit,GeeChao/junit,openhardnudd/junit,0359xiaodong/junit,cherryleer/junit,larrychen1990/junit,larrychen1990/junit,smayoorans/junit,avandeursen/junit,baev/junit,UnimibSoftEngCourse1516/lab2-es3-s.renzo,UnimibSoftEngCourse1516/lab2-es3-m.polonioli,hhariri/junit,paulduffin/junit,julien-sobczak/junit,kobe73er/dUnit,UnimibSoftEngCourse1516/lab2-es3-e.nani1,VikingDen/junit,UnimibSoftEngCourse1516/lab2-es3-a.tundo,MingxuanChen/junit,jhfjhfj1/junit,mekwin87/junit4,elijah513/junit,AxelMonroyX/junit4,rwarren14/junit,moinuddin14/junit,1234-/junit,UnimibSoftEngCourse1516/lab2-es3-f.spinardi,vorburger/junit,nathanchen/JUnitCodeReading,UnimibSoftEngCourse1516/lab2-es3-f.giannini3,slezier/junit,UnimibSoftEngCourse1516/lab2-es3-a.mosini,UrsMetz/junit,stefanbirkner/junit,witcxc/junit,UnimibSoftEngCourse1516/lab2-es3-l.salvestrini,paulduffin/junit,adko-pl/junit,edwardmlyte/junit,kcooney/junit,panchenko/junit,adko-pl/junit,songfj/junit,janocat/junit,alb-i986/junit,UnimibSoftEngCourse1516/lab2-es3-s.ravetta,freezhan/junit,smayoorans/junit,schauder/junit,janocat/junit,VikingDen/junit,witcxc/junit,avandeursen/junit,schauder/junit,yusuke/junit,dvberkel/junit,UnimibSoftEngCourse1516/lab2-es3-o.sertori,onesfreedom/junit,0359xiaodong/junit,hansjoachim/junit,chrisvest/junit,junit-team/junit,UnimibSoftEngCourse1516/lab2-es3-o.sertori,dvberkel/junit,stefanbirkner/junit,UnimibSoftEngCourse1516/lab2-es3-a.mosini,moinuddin14/junit,rwarren14/junit,UnimibSoftEngCourse1516/lab2-es3-f.cirelli1,cherryleer/junit,MichaelJY91/junit,UrsMetz/junit,MichaelJY91/junit,UnimibSoftEngCourse1516/lab2-es3-i.pigazzini,adko-pl/junit,vorburger/junit,kobe73er/MyUnit,baev/junit,kobe73er/MyUnit,elijah513/junit,panchenko/junit,sposam/junit,rws-github/junit,JoaquinSiabra/junit,GeeChao/junit,powazny/junit4,MingxuanChen/junit,UnimibSoftEngCourse1516/lab2-es3-a.mosini,mekwin87/junit4,JoaquinSiabra/junit,ashleyfrieze/junit,UnimibSoftEngCourse1516/lab2-es3-m.scarpone,UnimibSoftEngCourse1516/lab2-es3-s.renzo,laercioferracini/junit,hansjoachim/junit,chrisvest/junit,junit-team/junit4,UnimibSoftEngCourse1516/lab2-es3-i.pigazzini,eamonnmcmanus/junit,alohageck0/junit,songfj/junit,schauder/junit,baev/junit,slezier/junit,junit-team/junit,hhariri/junit,sposam/junit,jordancheah/junit,larrychen1990/junit,junit-team/junit4,mnk/junit,edwardmlyte/junit,1234-/junit,UnimibSoftEngCourse1516/lab2-es3-s.ravetta,Clairebi/JUnit-Clone,kobe73er/dUnit,y-kt/junit,kobe73er/MyUnit,mekwin87/junit4,UrsMetz/junit,marcphilipp/junit,smayoorans/junit,y-kt/junit,stefanbirkner/junit,yusuke/junit,ashleyfrieze/junit,Clairebi/JUnit-Clone,jordancheah/junit,jhfjhfj1/junit,junit-team/junit4,jordancheah/junit,jhfjhfj1/junit,easyMan-zzy/junit,ashleyfrieze/junit,Siddartha07/junit,UnimibSoftEngCourse1516/lab2-es3-m.vella6,janocat/junit,nathanchen/JUnitCodeReading,paulduffin/junit,Thothius/junit,quentin9696/junit,feisuo/junit,elijah513/junit,UrsMetz/junit,flomotlik/junit,mnk/junit,cherryleer/junit,UnimibSoftEngCourse1516/lab2-es3-f.giannini3,openhardnudd/junit,panchenko/junit,witcxc/junit,hansjoachim/junit,remus32/junit,rwarren14/junit,kcooney/junit,Thothius/junit,Clairebi/JUnit-Clone,alb-i986/junit,Thothius/junit,VikingDen/junit,0359xiaodong/junit,flomotlik/junit,marcphilipp/junit,julien-sobczak/junit,openhardnudd/junit,UnimibSoftEngCourse1516/lab2-es3-f.cirelli1,remus32/junit,rws-github/junit,GeeChao/junit,julien-sobczak/junit,UnimibSoftEngCourse1516/lab2-es3-f.spinardi,yusuke/junit,eamonnmcmanus/junit,UnimibSoftEngCourse1516/lab2-es3-f.spinardi,easyMan-zzy/junit,onesfreedom/junit,Siddartha07/junit,MichaelJY91/junit,nathanchen/JUnitCodeReading,UnimibSoftEngCourse1516/lab2-es3-m.vella6,UnimibSoftEngCourse1516/lab2-es3-m.scarpone,feisuo/junit,avandeursen/junit,UnimibSoftEngCourse1516/lab2-es3-m.polonioli,UnimibSoftEngCourse1516/lab2-es3-f.cirelli1,UnimibSoftEngCourse1516/lab2-es3-o.sertori,kcooney/junit,UnimibSoftEngCourse1516/lab2-es3-f.giannini3,rws-github/junit,JoaquinSiabra/junit,sposam/junit,powazny/junit4,remus32/junit,edwardmlyte/junit,UnimibSoftEngCourse1516/lab2-es3-i.pigazzini,AxelMonroyX/junit4,alb-i986/junit,UnimibSoftEngCourse1516/lab2-es3-m.vella6,1234-/junit,vorburger/junit,MingxuanChen/junit,freezhan/junit,UnimibSoftEngCourse1516/lab2-es3-a.tundo,nathanchen/JUnitCodeReading,slezier/junit,moinuddin14/junit,hhariri/junit,laercioferracini/junit,quentin9696/junit,alohageck0/junit,onesfreedom/junit,UnimibSoftEngCourse1516/lab2-es3-s.renzo,AxelMonroyX/junit4,mekwin87/junit4,UnimibSoftEngCourse1516/lab2-es3-l.salvestrini,junit-team/junit,vorburger/junit,songfj/junit,chrisvest/junit,flomotlik/junit,UnimibSoftEngCourse1516/lab2-es3-l.salvestrini,dvberkel/junit,UnimibSoftEngCourse1516/lab2-es3-e.nani1,kobe73er/dUnit,UnimibSoftEngCourse1516/lab2-es3-m.scarpone,y-kt/junit,UnimibSoftEngCourse1516/lab2-es3-m.polonioli,UnimibSoftEngCourse1516/lab2-es3-s.ravetta,UnimibSoftEngCourse1516/lab2-es3-e.nani1,Siddartha07/junit,powazny/junit4,rws-github/j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