scalez challenge - closest vector
Console App:
run (on linux): sh console.sh
Web App:
run (on linux) : sh run.sh and then run in another browser
http://localhost:5000/build/1 2 3;5 6 7 (or curl http://localhost:5000/build/1%202%203;5%206%207)
http://localhost:5000/query/5 6 7 (or curl http://localhost:5000/query/5%206%207)
**Notice that validation of inputs are missing
added implementation of kdtree from https://github.com/Vectorized/Python-KD-Tree