Add another placeholder on SolveMethodStats
Add d3 and nvd3 to index.html includes
Fix pluralization in API stub
Add some styles for charts
Add API stub fixtures for solves, method results, and step results
Add SolveMethodStatsRoute model
Add SolveMethodStats graphs and controller definition

Includes 2 components for a line with focus chart, and pie/donut charts.

There are mechanisms in place in this commit for syncing line disabled
state, and the represented data in the pie chart with the line graph’s
brushed focus, but there’s some weird bug where changing the disabled
state from the dependent pie graph won’t work.  I’m just going to hack
around it, but I wanted to get this commit in with the problem, so I
can come back to it at this point.

Notes about the behavior are in componentSyncingProblems.txt