[data-viz] change display_data_viz method in data_viz_helper to create a div with right id
[data-viz] add raphael library in vendor and add first version of raphael_overlay to create the data-viz
[data-viz] upgrade glow object with linked objects
[data-viz] First algorithm to find right random position
[data-viz] delete raphael.js and use raphael-min.js
[data-viz] add stylesheets for 3D buttons + display of button to refresh and to save position
[data_viz] beginning of save position button + add 3D button css
[data_viz] add data_viz_url in routes.rb to access to data model display
[data_viz] create default folder /files/data_viz + save file
[data_viz] Get the object positions from the json file
Merge pull request #2 from guigeekz/master

[data-viz] add design version