add some code in visualization
Merge branch 'master' of https://github.com/leituo56/SocialNetworkArtist_CMPE272_Group6
resolve conflict
Merge branch 'sammie_visualization'
Merge branch 'master' of https://github.com/leituo56/SocialNetworkArtist_CMPE272_Group6
Merge branch 'master' of https://github.com/leituo56/SocialNetworkArtist_CMPE272_Group6
Merge branch 'master' of https://github.com/leituo56/SocialNetworkArtist_CMPE272_Group6
Merge branch 'master' of https://github.com/leituo56/SocialNetworkArtist_CMPE272_Group6
Merge branch 'master' of https://github.com/leituo56/SocialNetworkArtist_CMPE272_Group6