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
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 branch 'develop' of https://github.com/ScottLogic/insight into develop

Conflicts:
	Changelog.txt
	src/mda/DataSet.js
	src/mda/Dimension.js
	src/mda/Grouping.js
Updated @memberof! insight.Axis to insight.Table
Remove deprecated ScatterSeries.pointRadius function

Also updates tests
Merge pull request #247 from niksoper/develop

Fixed Table documentation
Merge pull request #248 from matthewdunsdon/remove-deprecated-functions

Remove deprecated ScatterSeries.pointRadius function
Updated version number and release date
Merge pull request #249 from niksoper/develop

Updated version number and release date
Updated README version numbers and change log text
Updated version number in package.json
Merge pull request #251 from niksoper/develop

Updated version numbers and change log text
Merge pull request #252 from ScottLogic/develop

Merging develop into master for v1.2.0 release