Add curent weight to projects
Project#set_current_weight before create
Add once a day flag to projects
Projects#form: once a day checkbox
Project#choice: use current weight
ProjectChoose#choose: handle once a day projects
[refactor] ProjectChooser#choose: do not load project twice from db
Project: update current weight every time weight has been changed
[refactor] ProjectChooser#handle_once_a_day_project: use update_attribute instead of update_attributes