Adds the ability to reset the application after a request is handled.

[sikhlana]

Q	A
Bug fix?	No
New feature?	Yes

Description

This PR resets the state of the application after a request is handled by a worker by enabling the --reset-application switch which will remove instances related to auth, request and session and unqueue any dangling cookies from the application.

Fixes #22

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I wrote unit tests for my code (if tests is required for my changes)
• [x] I have made changes in CHANGELOG.md file

[tarampampam]

Close #26

[tarampampam]

Great thanks for your contribution!