Merge pull request #7 from Minisai/R-9_Manage_team_page

R-9: team creation ability
add maildrillapp for production mails
add gem for assets on heroku
add reliable angular injection
prevent dashboard#show page crushing than no teams
move templates from assets to views
add simplecov
fix failed tests
write specs for teams controller
add drag&drop js
add serializers
add callbacks on drag'n'drop
implement add player to team and remove player from team functionality
minor fixies
write specs