GSoC students section

[Sumith1896]

I have a new GSoC students in the navbar if you noticed. What this field should do is list the students(as listed in People aggregated) we select. So it should work as People aggregated but only for selected candidates. (This should be possible by an extra field in config file or so).

And here if the last post of the person is > 7 days, it should be displayed in red.
We have a rule of one blog post per week for GSoC students, this will capture that.

/cc @certik @asmeurer @ranveeraggarwal