cleanup on 83c0f41e4c, startup performance regression

[thehunmonkgroup]

this cleanup uses standard backbone architecture to avoid sorting
prior to all collections being loaded. i've included a note for
future developers about the issue, and added some defensive coding
for all other collections being loaded, to prevent similar issues
in the future.

for testing, i added a console log to the user comparator, and this
log output shows it's not called until after all collections are loaded:

info:    redis ready
info:    redis-sync initialized
info:    loading user/*
info:    loading event/?????
info:    loading event/*/hoa/*
warn:    No redis data for event/*/hoa/*
info:    loading event/*/sessions/*
info:    loading session/permalink/*
warn:    No redis data for session/permalink/*
info:    Done loading models.
HIT COMPARATOR
HIT COMPARATOR
HIT COMPARATOR
HIT COMPARATOR
HIT COMPARATOR
HIT COMPARATOR