Move organization chart into team structure page

This is a first pass at closing #833.

The organization chart previously generated by Google Charts has been replaced with a simple CSS/HTML solution that renders largely the same as before.  The chart has been moved into the team structure page, replacing the vertical list that used to be there.

Screen shot:
![Screen_Shot_2016-10-31_at_6.06.13_PM](/uploads/27c26cc14fe0de2482d7ae35addf06f9/Screen_Shot_2016-10-31_at_6.06.13_PM.png)

Concerns:
- Currently a webkit hack is employed in order to prevent the scroll bar from auto-hiding in OSX, but there doesn't seem to be a similar solution for Firefox.  This has not been tested on Windows or IE/Edge.
- The team structure list being replaced with this org chart had a lot of helpful links to the handbook as well as to job openings which are missing from this chart.

Future considerations:
- Eventually, this chart should be made compact and responsive.  Nodes that are three levels deep or more should be collapsed into vertical lists to prevent an extremely long scrollbar.
- CSS media queries can be used to automatically convert this horizontal chart back into a vertical list on mobile devices (since underneath everything it is simply `<ul />` and `<li />` elements.

See merge request !3690