Merge branch 'WebUI' of https://github.com/songsense/Pregelix_Social_Graph

* 'WebUI' of https://github.com/songsense/Pregelix_Social_Graph:
  introduction version
  add introduction framework and contact us
  increase community node number
Merge branch 'WebUI' of https://github.com/songsense/Pregelix_Social_Graph

* 'WebUI' of https://github.com/songsense/Pregelix_Social_Graph:
  introduction complete and modify community display
commit before pull new code
delete binary files