upgrade to scala 2.10.2, akka 2.2, aws sdk 1.5.4

hi piotr, here's my stab at it. i've started learning scala & akka a few weeks ago and haven't used dynamodb before, so pour a glass of the good stuff, sit down and brace yourself for the horrors to follow. looking forward to seeing how it really should be done! 

the AWS API changed quite a bit, which is where i spent 90% of time my on, the akka stuff Just Works(tm) by the looks of it. i can take a closer look at that another day. 

thanks
peter