Vkuzb lvuiui 62

Guys, i've made grid relational...review my code please :)
if this single file will be used by other grids (users, teachers, etc..) as a reference, move all group related code to 'scripts/views/group.js'
if for other grids, we need to copy this whole file and change collection parameters in the new file, move grid.js to 
'scripts/views/' and rename it to group.js