create routes for reminder on project
create concern to handle with reminder things on project

added method to check if some user already have a reminder notification
scheduled
added method to check if user as an valid contribution for some project
reminder notification template
reminder controller to schedule / remove an reminder notification
added reminder links inside project show
adjust to show when user is not logged
Merge pull request #884 from devton/feature/reminder-on-projects

Reminder on projects :D