refine import for new style of spreadsheet
remove valid_last_name method
add Mandrill
add family card report mailer method
do not require emails to upload family cards
separate out expiration date, make users and family cards dependent
sure, let's just refactor everything

Import was incredibly slow trying to create Users and
FamilyCards at the same time. So, now we can create
them separately and do so by inserting whole chunks of data.
add views for family cards and users, force reset password ability
Merge pull request #11 from CoolCulture/refactor-family-card-import

Refactor family card import