This change changes the server-side code in Sonar to use ES6 modules and

more idiomatic and consistent syntax. The only thing left that's still

using module.exports is lib/schema, which manipulates the exports at

runtime (something ES6 modules can't do). A future refactor will address

this.
As part of this, I've updated the aws-sdk and memjs dependencies to

get newer versions which support promises. This allows us to move

entirely over to native promises, eliminating the Q library.

Went through the various functionality of the server and verified that

things work as expected.