Add lein-deploy-app plugin for s3 upload
Add main method

This means that we can build with `lein uberjar` instead of `lein ring
uberjar`, essentially a kind of pointless update but it does fit better
into the tool chain, particularly the deploy-app plugin that calls `lein
uberjar`.
lein-release plugin: preparing 0.1.1 release
lein-release plugin: bumped version from 0.1.1 to 0.1.2-SNAPSHOT for next development cycle