Refactoring admissions

[admissions] refactoring admissions views
[admissions] admissions_controller: refactoring private method load_p… …
[admissions] admissions_controller: refactoring create_multiple
[admissions] admissions_controller: fixing change_student_state [add … …
[admissions] admissions model: return record in assigning admission p… …
[admissions] admissions_controller: fixing create
[admissions] admissions_controller: refactoring create_multiple
[admissions] admissions_controller: refactoring student_chooser