Refactored axis generation into a set

The axis points now exist as a set of objects which will allow for
them to be brought forward atop any other objects as required.
Merge branch 'master' of ssh://github.com/datalas/SCG

Conflicts:
	src/chart.js
Fixed flickery pie charts on hover

The text when it is added can shift focus making the piechart collapse
and then come back up as the element is removed.