Updated structure of tests
Moved ChartGroup tests into charts directory.
Pearson correlation calculation on raw inputs.
Calculating correlation coefficients on groupings.
Merge pull request #93 from Stavrakakis/master

ICS-49, ICS-71: Fix to automargin
Updated structure of tests
Moved ChartGroup tests into charts directory.
Pearson correlation calculation on raw inputs.
Calculating correlation coefficients on groupings.
Fixed jsdoc error for array of arrays.
Tests for lastElement array helper.
Removed duplicate test.
Removed unnecessary bind on chartFilterHandler.
Tidied up correlation calculations.
Removed zip containing library code and docs.
Fixed test for correlation calculation on a filtered chart.
Merge branch 'upstream'
Refactored calculating correlation from raw values.
Updates changelog

Adds details for all features of the library.
Updated tests for correlation.fromValues to include exceptions.