add chartkick
stick in sample chart to see chart loading
add groupdate gem
experiment with chartkick and activerecord
modify graphs
add tests for laplace and gemfile for stat distributions
add random-ish sequential times for hits per generated run
render chart of vehicles passing per hour on run page
Merge branch 'feat-add-chartkick'

* feat-add-chartkick:
  render chart of vehicles passing per hour on run page
  add random-ish sequential times for hits per generated run
  add tests for laplace and gemfile for stat distributions
  modify graphs
  experiment with chartkick and activerecord
  add groupdate gem
  stick in sample chart to see chart loading
  add chartkick