Resolve TODOs and formatting of Handler module

Resolve the TODO comments regarding logging output in the Handler
module and, at the same time, the code formatting, comments and
organisation.
Comments and log delete init doc number
Merge remote-tracking branch 'origin/master' into wip-cleanse-handler

Conflicts:
	lib/Retcon/Handler.hs
Merge pull request #65 from anchor/wip-cleanse-handler

Resolve TODOs and formatting of Handler module