update shoulda-matchers gem
add motivation model
add player_mailer
add bootstrap modal support and templates
create actions for send_message, motivate functionality
add csrf header to angular
Add bootstrap modal window and notification functionality
add create motivation functionality
rename motivation_player table, add callback to send email
write specs for players controller
Merge pull request #5 from Minisai/R-8_motivate_and_send_message_functionality

R-8: Motivate and send message functionality