Merge pull request #49 from niksoper/master

Removed global grunt-cli prerequisite.
added comment to min and max calculations
removed delete conflicts
deleted series tests in old location
added doc folder delete task to build, to ensure docs are tidied up
updated commenting to fix documentation
added comments to other series and chart
updated comments
fixed color bug in column series
fixed color default in rowseries
Merge pull request #50 from Stavrakakis/master

Axis refactor
Unit tests for Chart (incomplete).
Merged axis refactor.
Fixed failing tests after merging axis refactor from master.
Completed tests for Chart.init() ready for review.