Add hacking instructions to README
Add manage.py restart command
add message below ascii QR code to alert users to change their font if necessary; closes #632
Add instructions for adding new users using Yubikey

Some organizational and formatting tweaks and typo fixes as well.
Test out automatic TOC with doctoc
Update to correct downloads location.

Note that https://downloads.vagrantup.com/  was giving an SSL error.
Clean up develop docs

Everything up through describing the development environment should be
good. The sections on the staging and prod environments could use more
work.

The intial setup instructions could also use testing.
Update development directions to work on Debian too
fix unecessary workaround in journalist_navigation_steps.py functional tests
Merge pull request #720 from freedomofpress/fix/readme-hacking

Add hacking instructions to README
Merge pull request #723 from freedomofpress/feature/manage-restart

Add manage.py restart command
Merge branch 'qr-font' of https://github.com/ihmccreery/securedrop into ihmccreery-qr-font
Additional advice for iTerm users who get messed up QR codes
Merge branch 'patch-1' of https://github.com/mfauzy/securedrop into mfauzy-patch-1

Conflicts:
	docs/develop.md
Merge pull request #729 from ihmccreery/functional-test-admin-logout

fix unecessary workaround in journalist logout functional tests