add modal window
Add some stylings
modify add_player modal
create separate name fields for user
create habtm coaches and players relation
rewrite authorization logic according to changes in coach <-> parent relations
fix search functionality
fix motivations
add invite action to coaches/player controller
add habtm realtion teams <-> players
change team playes logic
add pagination to teams on dashboard page
Add invitations and invited field to student
specs for coaches/players#invite
disable adding of invited players to team
Merge pull request #10 from Minisai/R-12_Add_player_popup

R-12: add player popup + implement some design