Changes for E-Library and File app

- Previously, all the requests (either from File or E-Library app) were going to ```file.py``` view file. Which is sorted out properly.
- Now E-Library and File app requests are going to their respective urls and views.
- Slashed out E-Library code from ```file.py``` view.

**Other subtle changes:**
- ```teaches``` relation is made 1:M by setting ```object_cardinality```to ```100``` in ```factory_type.py``` file.
- Changes in ```pagination.html``` : settled current page's url.

**Note:** Please run ```python manage.py filldb```