Add link to Discussions in Project
Add view Discussions in Project view
Add style to Descussions block
Controller#home - change index
Model#Discussion - change creator on belongs_to
Model#Project - add has_many link Project to Discussions
Controller#discussions - reconfigurate to own projects
Controlled#Discussion - change permit parameters
Config#routes - change routes
Controller#Project - change index view
Create file - _discussion.html.erb
Create file - create.js.erb
Projects#Create - change old redirection
Discussion#Create - add discussion creator
Discussion#Create - add format js
Descussions#index view - delete old link
Join project to discussion
Delete discussion creator
Add creator on Discussion