Version 4 of AIVA

[kengz]

From previous feedbacks, time for a version 4:

• [x] major improvements in code logic, refactoring, flow control
• [x] make it more techOps-friendly, with better config management, deployment binaries, npm scripts, proper logging
• [x] switch to CircleCI
• [x] add CC
• [x] strip to bare minimum for easier usage
• [x] less invasive installations, with minimal dependencies (the rest can be npm-ed)
• [x] improve control of socketIO clients and processes
• [x] make it light and extensible
• [x] rebuild Docker aiva v4
• [x] update docs