Initial commit of code for measure visual. 

Added D3.js
Replaced hard coded populations with code to pull from Thorax.Models.Measure.allPopulationCodes
began refactoring to be clearer to read
refactored, added in temporal references
Added lookup for population names and fixed spacing between populations
Initial measure viz toggling, single population functional
Update for better rendering; need population codes fixed for multiple populations
Functional measure view toggling for multiple populations with sloppy height fix