signups now are subdocuments
post_create_trip uses new model
attempt to fix lead trip queries
lead trip post now (mostly) works w/ new model
fix lead trip queries
this week query
manage trips queries new model
this week page complete, and added instance methods
use getSignupForUser method in this week page
update trip control, more virtual getters
fix signup POST
manage trips uses new model, simplified linear view
migrate trip control POST to new model
add comments to model instance methods
add signup type validator