Replaced the width & height attribuites of the svg with the viewBox attribute.
This mean that charts will auto size to the 100% width 100% height specified in the nv.d3.css on line 146.
This means users can use the width/height angular attributes to set a scale for the svg elements but get propper dynamic sizing.
If static sizing is desired use css to override the 100% width 100% height.
Merge branch 'auto-size' of https://github.com/WBad/angularjs-nvd3-directives into WBad-auto-size

Conflicts:
	dist/angularjs-nvd3-directives.js
	dist/angularjs-nvd3-directives.min.js
	src/directives/nvd3Directives.js
resolving conflicts
Merge branch 'WBad-auto-size'