Add alternate Rakefile
Add alternate Rakefile

Fixes #38

avillanu/uberapp,sdolmo/sinatra-activerecord,ZalmanB/sinatra-activerecord,avillanu/uberapp,janko-m/sinatra-activerecord,exviva/sinatra-activerecord,townie/sinatra-activerecord,BrunaNett/sinatra-activerecord