init rspec for unit testing
enable rspec monkey-patching

This commmit removes the line that disables rspec monkey-patching in order
to have access to a top-level `describe` method.
specified ruby version in Gemfile
add redis-objects to Gemfile
add sinatra to Gemfile
add rspec to Gemfile
add methods needed to test sinatra
add helper for sinatra testing
include SinatraHelpers module into rspec examples
remove redis-objects dependency
add sinatra-sequel gem with sqlite in Gemfile
replace sinatra-sequel with activerecord
add Rakefile with tasks from activerecord
add development database config
add rack-test gem to Gemfile
use test db when running specs
add config for test db
monkey-patch Rails.root and Rails.env
add database_cleaner to Gemfile
setup database_cleaner and run it before each example