Created files for the "About" page and edited other files.

Added the about url to the url.py file. Added the about request function to the views.py file. Created the the other files for the about page.
Updated the nav.jade file to link the about page.

Linked the about page in the nav.jade file "a.nav-link(href='about') About". Included the nav in
the about.jade file.
Merge branch 'master' of https://github.com/soelgary/SlapshotAlerts into aboutpage

Conflicts:
	SlapshotAlertsHome/templates/nav.jade
	SlapshotAlertsHome/views.py
Put home above about in the nav.jade file.
Merge pull request #12 from soelgary/aboutpage

Aboutpage