[aws] mocks and models for SNS
Fix misbehavior around connection to slave node in pool

The idea behind this fix is following:
if u connect to slave node its should notify u where is you master, then
u reconnect to master and perform any actions in front this server
rds event subscriptions
Fix build in ruby 1.8.7
Merge pull request #3358 from plribeiro3000/fix-travis-build-1.8.7

Fix build in ruby 1.8.7
Fixed the issue according pool request #3356
Merge pull request #3355 from engineyard/sns-modeling

SNS/RDS changes
Fix indentation
Merge pull request #1 from plribeiro3000/fix-indentation

Fix indentation
Merge pull request #3356 from oovoo/master

Fix misbehavior around connection to slave node in pool