Fixed bug with cache key in cache_controller
refactored factorial method to use Rails.cache.fetch
refactored sin method to use Rails.cache.fetch
refactored sin to use inject
fixed n+1 bug
fixed big list
fixed divide by zero error
moved email sending to an async request started from the browser
added test and method to get base64 version of image
instead of making a request for each image, put the base64 version of each image into the page
fixed wrong xpath query for tweet finding
cache tweets