MIS template updates


**Functionalities implemented:**

**1) State-wise Districts are populated in list**

   - Based on which State is selected, accordingly District's dropdown list is populated
   
   - State & District values are sorted in ascending order
   
   - Files modified:
   
     1) urls/ajax-urls.py - ```get_districts url setup```
     2) views/ajax_views.py - ```get_districts() view defined```
     3) templatetags/ndf_tags.py - ```Values sorted [Query updated using sort()]```
     4) templates/ndf/person_create_edit.html - ```Ajax call setup```