Use floor plane data for analysis

[jenny-s51]

• Create a route for DTW. Code already exists under web/public.
• Use that for calculating accuracy over floor plane data as well as exercise data itself
• Right now calculate for each joint as compared to reference joint trajectory and average over all joints. Later once Get over Reps code into anchor #67 is done, change this to save floor plane data for most important joint and calculate only for most imp joint.
• Data is already being saved into mongo, call DTW on ref data versus practice session data once user saves a SET