Clean addresses and contacts
Refactor notes
[model] move method to use from js view
[concert] little refacotr
[view/js] update index class group column with enrolled to class group students
[refactor] use rails4 where.not
Merge pull request #226 from Genshin/mass_cleaning_refactor_set_primary

[refactor] use rails4 where.not
Merge pull request #225 from Genshin/mass_cleaning_fix_class_group_index_update

Mass cleaning fix class group index update
Merge pull request #227 from Genshin/mass_cleaning

Mass cleaning