Add AIM adapter

fixes #645
fix two spelling mistakes in docs/scripting.md
fix making a user an admin multiple times over
expose the robot adapter via adapterName
use any registered extension
added Slack adapter to the list
Add Lingr adapter
Add a quick note about Script Load Order. Fixes #675
Version bump 2.7.3
Close trailing backtick
Prefer rediscloud over redistogo, because it's free plan includes persistence
More scripts