Add tool to generate a square polygon
user
```coffeescript
# Teaspoon includes some support files, but you can use anything from your own support path too.
# require support/jasmine-jquery-1.7.0
# require support/jasmine-jquery-2.0.0
# require support/jasmine-jquery-2.1.0
# require support/sinon
# require support/your-support-file
#
# PhantomJS (Teaspoons default driver) doesn't have support for Function.prototype.bind, which has caused confusion.
# Use this polyfill to avoid the confusion.
#= require support/phantomjs-shims
#
# You can require your own javascript files here. By default this will include everything in application, however you
# may get better load performance if you require the specific files that are being used in the spec that tests them.
#= require application
#
# Deferring execution
# If you're using CommonJS, RequireJS or some other asynchronous library you can defer execution. Call
# Teaspoon.execute() after everything has been loaded. Simple example of a timeout:
#
# Teaspoon.defer = true
# setTimeout(Teaspoon.execute, 1000)
#
# Matching files
# By default Teaspoon will look for files that match _spec.{js,js.coffee,.coffee}. Add a filename_spec.js file in your
# spec path and it'll be included in the default suite automatically. If you want to customize suites, check out the
# configuration in teaspoon_env.rb
#
# Manifest
# If you'd rather require your spec files manually (to control order for instance) you can disable the suite matcher in
# the configuration and use this file as a manifest.
#
# For more information: http://github.com/modeset/teaspoon

class window.Tools
  geod = GeographicLib.Geodesic.WGS84

  # Generate a square from a starting point (as a bottom right corner), clockwise, with specified distance
  @squareFrom: (point = [], distance) -> # ([lat, lng], number) -> [[lat,lng], [lat,lng], [lat,lng], [lat,lng]]
    square = []
    square.push(point)
    i = 0
    azimut = 0
    while i < 3
      r = geod.Direct(square[i][0], square[i][1], azimut, distance)
      # store new coordinate, as lat/lon pair
      square.push([r.lat2, r.lon2])
      # Move angle to 90 degrees
      azimut -= 90
      i++
    square


```
assistant