add require heart_of_heroku/apps to base lib
create client lib file
remove set_auth_key from module
move set_auth_key into client class
rename set_auth_key to new, functions as initializer for client class
change heroku_get to take an auth_key instead of using the previously defined constant
create account method, which returns account information for client
change Account.get_info to take auth_key as a parameter, since it is now tied to a user
refactor apps.rb to also accept auth_key in both of its methods
create method to get all apps for this account
add require for lib/heart_of_heroku/client
change method name from new to initialize (silly)
create client method, list_app_by_id