Upgrades Thinglator to use functional programming

[richardwillars]

A rewrite of Thinglator to fix multiple issues in one go.

• Switches from using classes to functional programming. It's faster, simpler and is easier to ready & tests.
• Upgrades to node 8. Allows for the use of async / await and moves away from chaining promises
• Enforces the use of constants for events
• Rewritten the comms interfaces and driver interfaces - results in an updated API that is more restrictive but simpler

[codecov-io]

Codecov Report

Merging #46 into master will decrease coverage by 3.46%. The diff coverage is 42.22%.

@@            Coverage Diff             @@
##           master      #46      +/-   ##
==========================================
- Coverage   48.33%   44.86%   -3.47%     
==========================================
  Files          19       25       +6     
  Lines         509      798     +289     
  Branches       50       92      +42     
==========================================
+ Hits          246      358     +112     
- Misses        263      385     +122     
- Partials        0       55      +55

Impacted Files	Coverage Δ
models/authenticationSchemas.js	100% <ø> (ø)	:arrow_up:
utils/event.js	89.28% <ø> (+46.86%)	:arrow_up:
management.js	0% <0%> (ø)
controllers/driver.js	0% <0%> (-10.77%)	:arrow_down:
utils/driver.js	0% <0%> (-12.2%)	:arrow_down:
app.js	0% <0%> (ø)
controllers/event.js	0% <0%> (-15.79%)	:arrow_down:
comms/index.js	0% <0%> (ø)
controllers/authenticate.js	0% <0%> (-8.83%)	:arrow_down:
eventCreators.js	100% <100%> (ø)
... and 24 more

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