Change aptitude upgrade to aptitude safe-upgrade

Fixes the below error when updating Vagrant
==> default: The "upgrade" command is deprecated; use "safe-upgrade"
instead.
Link Updates
Remove "Legal" Quotes

Fixes #521 - Removes the phrase “The Public Whip is a not-for-profit,
open source, project. Get the source code.”
Remove Legal Quotes (2)

Additional file after re-running the Test Suite.
Re-enabled CSRF protection for Policies and Divisions; fixes #445.
Merge pull request #530 from brfairless/vagrantupgrade2

Change aptitude upgrade to aptitude safe-upgrade
Merge pull request #532 from brfairless/463-aboutpage

Link Updates
Merge pull request #535 from brfairless/521-footerupdate

Remove "Legal" Quotes
Merge pull request #526 from damncabbage/csrf-protection-445

Re-enabled CSRF protection for Policies and Divisions.
Merge remote-tracking branch 'origin/test' into more_about_changes

Conflicts:
	app/views/home/_about.md