add record_sample! method + get status
add sample model
add sample relationship
add_sample migration
date -> datetime
save sample
add sample controller
add notification skeleleton method for samples
add function to detect persistent statuses
add route for samples
updated schema for samples
STATUS : variable -> constant
add notifications scaffold
add model relationship
add notifications mechanism
update with notifications
show only 50 most recent notifications, inverse order
add notification color
add notification views (debug only)
add samples views (debug only)