Update private, "internal" and public members to meet conventions.

Comments to separate each section (private, "internal", public).

A single var declaration for all simple private class variables.
Moved addSeries to internal functions and removed it from jsdocs.
Merge branch 'master' of https://github.com/ScottLogic/insight into dev

Conflicts:
	src/charts/Chart.js
Merge pull request #133 from niksoper/dev

Update private, "internal" and public members to meet conventions.