Slight change to GSoC ranking timeline

[Ross Gardler]

I have just made a slight change to the ranking timeline at [1] (not 
synced to main site at time of writing).

The main deadlines have not changed, I've simply highlighted deadlines 
for each phase of the ranking process.

I've notified code-awa...@a.o of the upcoming deadline.

[IMPORTANT] Admins (Noirin, Luciano and myself) please make sure you 
block out some time over the ranking period to work on this process.

Ross

[1] http://cwiki.apache.org/confluence/display/COMDEVxSITE/GSoC