Fix formatting in README
Include note about restarting the rails app if it's already running, …
…because the last 2 apps I used Devise with, I could not figure out why I was getting very strange errors, and finally today I figured out it was due to the fact that it needed to reload.
Remove deprecated examples from README, closes #1669.
Update README.doc to specify adding devise to the Gemfile.
Added a documentup link on README
Change README do markdown