Prefer more explicit assignment than 'tap'.

Visual flow is nicer, removes a dependency.
repeat github logins do not overwrite user's name.
Update rspec-rails to 3.0.0.beta1.
Update rails to 4.0.1 release (was rc2).
Update capybara to 2.2.0 (was 2.1.0).
Update sidekiq to 2.17.0 (was 2.15.1).
Update zurb-foundation to 4.3.2 (was 4.1.6).
update octokit.
ensure request insights are on new lines.