Tidy-up in buildSrc. Groovy->Java migration.
Tidy-up in buildSrc. Added coverage.
Tidy-up in buildSrc. Moved classes to internal package.
Tidy-up in buildSrc, moved classes around a bit.
Tidy-up in buildSrc - rewriting it from scratch
Tidy-up in buildSrc - fixes and coverage
Tidy-up in buildSrc - coverage, rename jobs
Tidy-up in buildSrc - coverage
Tidy-up in buildSrc - started using an interface where possible
Tidy-up in buildSrc - documentation, reduced visibility, made string representation explicit.
Tidy-up in buildSrc - coverage and some documentation

Busted complexity into separate classes.
Tidy-up in buildSrc - pushed out logic that ignores commits

In order to improve clarity of the impl. Reinvented the wheel with Predicate interface (I don't want external dependencies for now).
Tidy-up in buildSrc - removed not needed interface.
Tidy-up in buildSrc - major rewrite of some parts
Tidy-up in buildSrc - major rewrite of the GitHub issues fetcher, part II.
Tidy-up in buildSrc - major rewrite of the GitHub issues fetcher, part III.
Tidy-up in buildSrc - major rewrite of the GitHub issues fetcher, part IV.
Release notes automation rework.
Release notes automation tidy-up.

Fixes #119
Release notes automation tidy-up and fixes.

Fixes #119