Remove Grid dependency (GitHub graph)

[scienmanas]

This is for the enhancement of the project. The following stuff needs to be changed/implemented:

1. Removal of GitHub graph dependency so prevent crashed while upgrading next to new version.
2. Tooltip to show counting of commits.
3. Some nice animation to let users customize the stuff or their names which will be shown as in the graph

P.S.: Use of d3.js is recommended as it has a long history of decently maintained.