The router tree display is being clipped at the top

[barretodavid]

When the router tree is too big, the top part of the graph is clipped and is not visible. The scrollbar doesn't seem to be working properly.

[andrewlo]

This is because the svg element dimensions are hardcoded at 1000 x 500 in the router tree.

https://groups.google.com/forum/#!topic/d3-js/7Js0dGrnyek
http://stackoverflow.com/questions/22006483/how-to-set-svgsdraw-by-d3-js-height-based-on-the-content

[sumitarora]

@andrewlo we know the issue just need to fix it. Can you check if increasing dimension fixes the issue or we have to make it dynamic which might be trivial ?