Created preferences page which allows users to change and store their preferences in the DB

[Icyviolet23]

Resolves bonus in #37

Major changes

1. Added Preferences Model
2. Added one to one relation between the Preferences Model and the Abstract User model. Each User will have their own preferences.
3. Added Preferences ModelForm which will be used to collect user preferences
4. Added view to handle Preferences Form POST request, create an instance of the Preferences model and save it in the DB
5. Created HTML Template for preferences page
6. Edited HTML template for navigation.html to add navigation to preferences page

Refer to the following DEMO:
Uploading Home (1).webm…

[codeclimate]

Code Climate has analyzed commit 251c3a5 and detected 51 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2
Style	49

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