Change legend checkbox x to not touch corners
	revert axis padding
	add tooltip format as separate from x & y axes formats

	modified:   examples/lineWithFocusChartMultiCoordinates.html
	modified:   nv.d3.js
	modified:   nv.d3.min.js
	modified:   src/models/axis.js
	modified:   src/models/legend.js
	modified:   src/models/lineWithFocusChartMultiCoordinates.js