Add retry behavior to all dynamo requests.
Add retry behavior to all dynamo requests.

We will try every operation 5 times, with an exponentially growing
time between them. It will start at 500 milliseconds and grow by a
factor of 1.5.
erpframework/ShareJS,a0x/ShareJS,dialoghq/ShareJS,mcanthony/ShareJS,freewind/ShareJS,dialoghq/ShareJS,modulexcite/ShareJS,luto/ShareJS,playcanvas/ShareJS,igmcdowell/ShareJS,kantele/k-share,gdseller/ShareJS,rchrd2/ShareJS,igmcdowell/ShareJS,playcanvas/ShareJS,share/ShareJS,kustomzone/ShareJS,ceros/ShareJS,rasata/ShareJS,gdseller/ShareJS,Nzaga/ShareJS,ceros/ShareJS,matthewbauer/ShareJS,dialoghq/ShareJS