update lists of example apps
rails 4.2
add omniauth tutorial link
update list of starter apps
add links to pundit tutorial
update rails-examples-tutorials
add jmuheim starter app
add link to rails-devise-pundit
update list of app templates
add 'join railsapps' ad
add 'Learn Ruby on Rails' book
update home; add example apps
update
update link
learn-rails coming soon
add learn-rails website
update links from railsapps.github.com to railsapps.github.io
change link to rails-prelaunch-signup tutorial
change links to tutorials
tweak
update app template lists
update starter app list