#33 is_attenting method was added to DoctorUser class. This method return bool value:  true if exist processing appointments and false else.
#33 start_appointment and finish_appointment methods were added to DoctorUser class.
#33 Start appointment button and it's handler were added to all_appointments.js.coffee.  Start appointment functional was added to /cabinet/doctor/appointment_controller.
#33 Fix: start appointment link-button is rendered for appointment with status 'busy' only.
#33 It was added appointment starting and stopping control system. If user started two and more appointments or appointment was started no busy status or  one was stopped no process status, will be exception thrown.
#33 Page reload invoking was added to all_appointments.js.coffee. Refreshing would be  occurred if start_appointment() returned success status.
#33 It was added the processing appointment button.
#33 Appointment_show module was added to backbone doctor cabinet. Current appointment notification was moved under the menu panel.
#33 Link to appointment show was added to all appointments page
#33 Link to processing appointment show was added to processing appointment notification. processing_appointment method was added to doctor model (it getting `id` field only). Fix DoctorUser.is_attending? - the needless ordering by date was excluded.
#33 `is_processing?` method was added to appointment event model. Complete/Begin appointment buttons were added to appointment show page in doctor cabinet.
#33 Handlers for start/stop button were added to appointment show page.
#33 In appointment event model every hash-formed constants were replaced to single  apostrophe-form.
#33 Starting and stopping appointments. Start and stop button were replaced to self-sufficient partial
Close #33 New columns were added for event model - real_start_time and real_start_end. A time accounting was added for starting appointment and  stopping  of appointments'   - now is counting real data_time and date_end.
Merge branch 'doctor_appoointment_end'