Recommend ngrok or localtunnel.me over localtunnel rubygem

* Thanks to @step21 for this in PRs #73 #74 #75
Bump Rails patch version
Add information about repo visibility
Convert field information popups to bootstrap popovers
Fixup markdown reference link
Follow pagination links for #67
Explicitly load .env file with dotenv
Fix dotenv
Merge pull request #79 from esteve/fix-dotenv

Fix dotenv
Bump Ruby version. See https://devcenter.heroku.com/articles/ruby-support#supported-runtimes
Also update .travis.yml to ruby 2.1.4
Allow agreement owner to delete agreement #60
Add GitHubLimited strategy to avoid using public_repo scope on GitHub
Direct user through /auth/github for public_repo scope prior to creating agreement
Update tests for GitHubLimited OAuth strategy
Updated Deploy.md: described LIMITED keys

Also removed the `heroku restart` command as it is redundant.
specifying host name
mention checking out this repo
ensure directory is correct
Merge pull request #90 from hrj/patch-1

Updated Deploy.md: described LIMITED keys and HOST