Update scala to 2.11.7 and spark to 1.5.2

[Alexey Kuznetsov]

Hi!

How about to update dependencies?

scala to 2.11.7 and spark to 1.5.2

Any objections?

If no I will create issue and update.
-- 
Alexey Kuznetsov
GridGain Systems
www.gridgain.com