Using @constructor rather than @class

@constructor and @class are synonyms and @constructor is a better fit
because there is technically no such thing as a class in JS
Merge branch 'develop' of https://github.com/ScottLogic/insight into jsdocs-constructor

Conflicts:
	src/charts/Series/ColumnSeries.js
	src/charts/Series/RowSeries.js
	src/utils/Scale.js
Renamed files to match lowercase convention
Renamed insight.Constants => insight.constants
Renamed insight.Utils => insight.utils
Updated Constants => constants, after merging from upstream
Updated @class to @constructor after review
Merge pull request #240 from niksoper/lowercase-consistency

Lowercase consistency
Merge branch 'develop' of https://github.com/ScottLogic/insight into jsdocs-constructor
Merge pull request #239 from niksoper/jsdocs-constructor

Jsdocs constructor
Merge branch 'upstream' into develop