Updating to RabbitMQ client 3.3.2
Changed target framework for Data and Transport libraries to v3.5

There's no particular reason to keep them at 4.5, and changing them to
target 3.5 by default means that anyone who just checks out the repo can
directly build the code for Unity and older platforms.
Code clean up, expanded comments
Expanded README with notes about Unity
Merge branch 'release/0.1.3'