Fixes for some issues on lineWithFocusChartMultiCoordinates
	Added brush handler for lineWithFocusChartMultiCoordinates
	Changed Y-axes axisMaxMin padding
	etc.
	modified:   nv.d3.js
	modified:   nv.d3.min.js
	modified:   src/models/axis.js
	modified:   src/models/lineWithFocusChartMultiCoordinates.js
	Added a new type of legend selector - rectangular checkboxes
	Also modified lineWithFocusChartMultiCoordinates to be an example
	Fixed issues on lineWithFocusChartMultiCoordinates
	modified:   examples/lineWithFocusChartMultiCoordinates.html
	modified:   nv.d3.css
	modified:   nv.d3.js
	modified:   nv.d3.min.css
	modified:   nv.d3.min.js
	modified:   src/models/legend.js
	modified:   src/models/lineWithFocusChartMultiCoordinates.js
	modified:   src/nv.d3.css
	Commented-out old circular legend, with the newer checkbox-style ones
	modified:   nv.d3.css
	modified:   nv.d3.js
	modified:   nv.d3.min.css
	modified:   nv.d3.min.js
	modified:   src/models/legend.js